Use ‘acidulous’ to describe a hint of sourness, less intense than outright sour or bitter flavors.

Subtle Sourness

Apply ‘acidulous’ for mildly sarcastic or critical remarks, often in a clever or witty way.

Mild Critique

Although it can imply negativity, 'acidulous' may just highlight a tangy quality that's not bad.

'Acidulous' often implies intelligence behind the sharpness; it’s a smart, incisive kind of criticism.

The word can convey the speaker's disapproval or discomfort in a situation, often subtly.

'Acidulous' isn't always completely negative; it might suggest critical thought or constructive feedback.