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Definition of acrid : 1. Causing heat and irritation; corrosive; as, acrid secretions.
2. Caustic; bitter; bitterly irritating; as, acrid temper, mind, writing.
3. Sharp and harsh, or bitter and not, to the taste; pungent; as, acrid salts.

Synonyms:

red-hot, savage, nasty, bland, unpalatable, acid, erosive, stinging, biting, sultry, acetous, venomous, harsh, resentful, barbed, truculent, insipid, corrosive, blistery, sulphurous, slashing, trenchant, unpleasant, ad hominem, tasteless, smart-mouthed, hard, irritating, vitriolic, sardonic, smart-alecky, tart, vinegarish, attack, sore, inedible, virulent, smart-aleck, stale, acidulated, sarcastic, scalding, accusing, embittered, taste, nipping, acidulent, mordacious, mordant, stifling, acidulous, acerbic, acrimonious, acerb, acidic, rancid, blistering, accusatory, hot, astringent, satiric, rancorous, cutting, irate, bad, sulfurous, respect, scathing, deadly, snarky

poignant, bitter, sour, pungent, sharp, spicy, caustic, piquant, tangy

Usage examples:

• A cold wind swept between the thin spruce trunks that loomed vaguely out of the surrounding gloom as the red glare leaped up, and wisps of acrid smoke drifted about the camp. - "Blake's Burden", Harold Bindloss.
• To blunt its acrid qualities, it is usual to combine it with opiates. - "A Narrative of the Expedition to Botany Bay", Watkin Tench.
• A half mile nearer and the acrid taste in the air turned to a defined veil of smoke, intangible and unreal, at first, which merely seemed to hang about the trunks of the mighty trees and make them seem dim and far away. - "The Boy With the U. S. Foresters", Francis Rolt-Wheeler.