sour

hapan

happamuus

sour

epävireinen Having an acidic, sharp or tangy taste.

(ux)

All sour things, as vinegar, provoke appetite.

(rfe)

He was a scholar (..) / Lofty and sour to them that loved him not, / But to those men that sought him sweet as summer.

sour adversity

Unlike what the name implies, there is nothing inherently wrong with a sour note: It is perfectly well-tuned note that would sound normal in another context (and which presumably would not sound sour to someone unfamiliar with tonal music).

(rfquotek)

So the sun's heat, with different powers, / Ripens the grape, the liquor sours.

To sour your happiness I must report, / The queen is dead.

He was prudent and industrious, and so good a husbandman, that he might have led a very easy and comfortable life, had not an arrant vixen of a wife soured his domestic quiet.