err-, errat- +

(Latin: wander, stray, rove)

aberr
To wander; to stray.
aberrance (s) (noun), aberrances (pl)
1. A state or condition significantly different from the normal: "The reality of the housing development was certainly an aberrance from what Sam had expected."
2. A wandering from what is considered to be the right way; a deviation from truth: "The confessions by the criminals that were made at the police station appeared to be aberrances when compared to the actual facts of the case."
aberrancy (s) (noun), aberrancies (pl)
1. A condition that is significantly different from the normal; wandering; divergent, unusual: "Stealing is considered an aberrancy in terms of social expectations."
2. That which has departed or turned away from what is considered to be normal, right, or a usual course: "Dr. Carla was concerned about several aberrancies which she detected during the routine health examination of her patient."
aberrant (adjective)
1. A reference to someone who is deviating from what is considered to be proper or from an expected course of action: "Timothy's aberrant personality frequently got him into trouble with his employers."

"Driving on the wrong side of a road is considered an aberrant driving practice and will result in a traffic ticket or may even cause a serious accident."

2. Deviating from the ordinary, usual, or normal type; exceptional; abnormal: "In circuses of the last century, there often were displays of pitiful animals that were aberrant in some way, like having an extra toe, a double tail, or more than one head."
aberrate (verb), aberrates; aberrated; aberrating
1. To diverge or deviate from what is expected by someone or those who are supposed to be doing something: "Henry's severe headache was the result of his aberrating from his commitment to staying sober."

"Carl decided to aberrate from the usual route to the farm when he took a side road."

"Allison was aberrating her normal work schedule so she could attend a concert in the evening."

2. To produce something that is not considered to be normal or proper: "When Claudia aberrates from her usual piano-practice schedule, her musical performance is never be up to its normal standard."

"The chemist accidentally mixed up the wrong chemical formula and therefore aberrated a very bad odor in the laboratory."

aberration (s) (noun), aberrations (pl)
1. A wandering or straying away; a departure or deviation from what is considered normal or from the socially recognized path: "The horror novel was considered an aberration as far as the tastes of the reading public were concerned."

"The new rules were confusing and full of aberrations."

2. A defect in a lens or mirror, causing a distorted image or one with colored edges: "The blurred photographs indicated that Ron's camera has a lens with an aberration."

"The flaw in a lens that doesn't focus properly is called a spherical aberration."

3. In astronomy, a small periodic change in the apparent position of a star or other astronomical object, caused by the motion of the earth around the sun: "The astronomer noticed an unusual aberration in the constellations of the Northern Hemisphere."

"In astronomy, an aberration is an apparent displacement in the position of a celestial object as a result of the time it takes for light from the object to reach an earthbound observer and to the orbital motion of the earth during that time."

4. A disorder or abnormal alteration in one's mental state: "Three authors got together to see how many aberrations they could include in the Worst Novel of the Year."

"The only aberration that Marcia's mother has is an occasional lapse of memory."

aberrational
Characterized by aberration.
arrant, arrantly, errant, errantly
arrant (AR uhnt) (adjective)
1. Used to emphasize that someone or something is an extreme example of that which is unacceptable: "This is arrant nonsense!"
2. Without qualification; used informally as (often pejorative) intensifiers: "Alton dismissed the rumors that he would quit his job as arrant nonsense."
arrantly (AR uhnt li) (adverb)
Of the worst kind, impudently or not showing respect for other people: "Pete was arrantly smoking in the non-smoking area of the restaurant."
errant (ER uhnt) (adjective)
1. Roving or wandering; especially, in search of adventure: "Sonia was reading about an errant traveler."
2. Straying from the proper course or correct standard: "Kristina could no longer tolerate her errant husband."
errantly (ER uhnt li) (adverb)
A reference to someone or something that goes outside of a specified area or a designated place: "The calf errantly went into the neighbor's garden."

Neal thought it was arrant behaviour when he saw the doctor arrantly smoking while standing outside the hospital. Is it possible that Violet is also errant in her personal health practices?

Perhaps Lindsey should have errantly gone outside to get some fresh air before continuing with the strenuous work that she was doing.

err
1. To go astray in thought or belief; to be mistaken; to be incorrect.
2. To go astray morally; to sin.
3. To deviate from the true course, aim, or purpose.
4. To wander from the right way; to deviate from the true course or purpose.
5. To miss the right way, in morals or religion.
6. To deviate from the path or line of duty.
7. To stray by design or mistake. 8. To make a mistake; to commit an error.
9. To do wrong from ignorance or inattention.
10. To wander; to ramble.
errableness
1. Liability to make an error.
2. A tendency to make a mistake or an error.
errabund
Erratic.
errancy
1. Fallibility as indicated by erring or a tendency to err.
2. Incorrect or morally wrong behavior.
3. A tendency to do wrong: the propensity for making mistakes or acting improperly.
4. Holding views that disagree with accepted church doctrine; especially, a disagreement with Papal infallibility.
errant, errantic
1. Behaving in an unacceptable manner.
2. Wandering from an intended course, or not reaching an intended destination.
3. Wandering in search of adventure and romance.
4. Deviating from the regular or proper course; erring; straying.
5. Journeying or traveling; such as, a medieval knight in quest of adventure; roving adventurously.
6. Moving in an aimless or lightly changing manner; such as, an errant breeze.
errantry
1. The condition of traveling or roving about, especially in search of adventure.
2. The wandering, romantic, and adventurous life of a knight errant.
Errare humanum est.
To err is human.

Another version is Errare est humanum. It was Alexander Pope, who wrote in his An Essay on Criticism that "To err is human, to forgive, divine."