Definition
Something acrid stings the nose, throat, or tongue with a sharp, biting unpleasantness — the smell of burning rubber, the taste of something scorched. The word comes from the Latin acer, 'sharp', and that sharpness is the point: an acrid trace can be faint and still bite hard. By extension a remark or a tone can be acrid, soured with bitterness. It is the keen, eye-watering edge of a thing, not its strength, that the word names.
Examples
Collocations
an acrid smell·acrid smoke·an acrid taste·acrid fumes·a faintly acrid tone
Synonyms
pungent·bitter·caustic·sharp·harsh
Antonyms
sweet·fragrant·mild
Word family
acridity (noun)·acridly (adverb)
In TOEFL & IELTS
A precise descriptive adjective for TOEFL/IELTS writing about smell, smoke, or taste, and figuratively for a sour tone. Pronounced /ˈækrɪd/, stress on the first syllable. The classic trap is confusing it with 'arid' (dry, of land) — same opening letters, unrelated meaning.