fac-, facil-, fact-, feas-, -feat, -fect, -feit, -facient, -faction, -fic-, -fy, -ficate, -fication

(Latin: to make, to do, to build, to cause, to produce; forming, shaping)

unjustified (adjective)
1. Lacking justification or authorization.
2. Shown to have no good or just reason or explanation. 3. Not arranged evenly in such a way that the ends of the lines on a page do not form a straight vertical line parallel to the margin.
unprofitable
unprofitableness
unprofitably
unqualified
unqualifiedly
unsatisfactorily (adverb), more unsatisfactorily, most unsatisfactorily
unsatisfactory (adjective), more unsatisfactory, most unsatisfactory
A reference to being unacceptable because of not being good enough: JoAnn found herself in an unsatisfactory situation when she couldn't start her car because of a dead battery.
unscientific (adjective), more unscientific, most unscientific
1. Relating to not adhering to the principles of science: Unscientific research is a process that results when someone is not consistent or logical when he or she is investigating something and not acquiring the proper results.
2. Characteristic of lacking sufficient knowledge about scientific methods: George's unscientific processes were done in illogical ways while he was investigating and striving to acquire an understanding about the animals that exist in the forest.
unscientifically (adverb), more unscientifically, most unscientifically
A reference to research that is not following, nor compatible, with the methods and principles of science: Adam unscientifically conducted a biological research about fish in the lake near his residence.
verifiable
verifiably
verification
1. The establishment of the truth or correctness of something by investigation or evidence.
2. The evidence that proves something true or correct.
3. In law, an affidavit swearing to the accuracy of a pleading.
verificationism
The view that every meaningful proposition is capable of being shown to be true or false.
verifier