Acidulous

slightly sour.
sharp; caustic:
his acidulous criticism of the book.
moderately acid or tart; subacid.
Historical Examples

Sudden, thunderous outpourings of acidulous and gluey fluid.
After the Rain Sam Vaknin

She might marry or might miss, or grow into an acidulous red-headed woman.
The Wind Bloweth Brian Oswald Donn-Byrne

In these villages there was great plenty of corn, and wine made from dates, and an acidulous drink obtained from them by boiling.
The First Four Books of Xenophon’s Anabasis Xenophon

She had no acidulous interest in puncturing sham for the sake of puncturing it.
The Trial of Callista Blake Edgar Pangborn

The latter moved in a sensuous deliberation, followed by a thin, acidulous trail of smoke, into inner rooms.
The Three Black Pennys Joseph Hergesheimer

There was an acidulous resentment in the tone of her answer that indicated that she wanted her husband to send me away.
Tramping on Life Harry Kemp

Fragrant; golden yellow; tastes oily, acidulous, and resinous.
Cooley’s Practical Receipts, Volume II Arnold Cooley

His gentle drawl was a capital foil to Lady Georgina’s acidulous soprano.
Miss Cayley’s Adventures Grant Allen

She is an acidulous maiden person with ultra-ritualistic tendencies.
The Spenders Harry Leon Wilson

If the process be continued, the distilled product becomes milky, scarcely spiritous to the smell, and of an acidulous taste.
A Treatise on Adulterations of Food, and Culinary Poisons Fredrick Accum

adjective
rather sour
sharp or sour in speech, manner, etc; acid
adj.

1769, “sub-acidic,” used figuratively for “sour-tempered;” from Latin acidulus “slightly sour,” a diminutive of acidus (see acid (adj.)).

acidulous a·cid·u·lous (ə-sĭj’ə-ləs)
adj.
Slightly acid or sour.