acuto-, acut-, acuti-, acu-, -cusis; also, agu-

(Latin: sharp, to sharpen; point; needle, pin)

cute
1. Clever; sharp; shrewd; pretty or attractive.
2. Etymology: cute was originally a shortened form of acute in the sense of being "keenly perceptive or discerning, shrewd".

It is considered likely that cute came to be used as a term of praise, or approval, for things that demonstrated "acuteness", and so it went on to develop its own sense of being "attractive" and "fetching".

hyperacuity
The increased sharpness of sense perceptions.
hyperacusia (s) (noun), hyperacusias (pl)
1. Abnormally sharp and loud hearing, sometimes resulting in pain even when only moderately loud sounds are in the area of the subject: "Brett had been diagnosed with hyperacusia which made his job of monitoring crowds at band concerts too difficult for him to tolerate any more because the sounds of the crowds and the bands were too painful for his ears."

"Deafness is not the only danger of noise exposure of hyperacusia; in fact, the stress causes some 45,000 fatal heart attacks a year in the developing world, according to researcher Dieter Schwela of the Stockholm Environment Institute."

—Compiled from information located in
"Noise" by Jonathon Keats; Discover magazine;
June, 2014; page 74.
2. Increased sharpness of hearing or a condition that exists when sounds are perceived as abnormally loud: "Although Caroline always wanted to attend a live concert with her favorite band, she was advised not to do so because of the hyperacusia in her ears which would make going to the concert a terribly painful experience."
hypoacuity
Decreased sharpness of sense perception.
peracute
Very acute or very sharp; very violent; as, a peracute fever with reference to a disease.
shaking ague
1. An acute febrile state with chills.
2. A severe form of malarial paroxysm (in medicine, a violent attack which may be due to the sudden occurrence of symptoms or the acute exacerbation [the abrupt worsening] of preexisting symptoms).
subacute
Less than acute or referring to a disease or other abnormal condition which is present in a person who appears to be clinically well.

The ailment may be identified or discovered with a laboratory test or radiologic examination.

The term subacute is used in contrast to acute, which indicates "a very sudden onset or a rapid change"; and chronic, that indicates "an indefinite period of time or no change".

In ancient Greece, the "father of medicine", Hippocrates, distinguished diseases that were acute (abrupt, sharp and brief) from those that were chronic (illness or pain which is serious and that lasts for a long time) and his diagnosis is still being applied in these modern times.

Subacute has been coined to designate the mid-ground between acute and chronic.

superacute
Extremely acute; that is, describing pain which is very strong and sharp and marked by an extreme severity of symptoms and fast progress; such as, a disease.

Cross references of word families that are related directly, or indirectly, to: "sour, sharp": acerb-; aceto-; acid-; acies- (not "sour"); oxy-; pung- (not "sour").