This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Forceful, effective, and vigorous: a trenchant argument. See Synonyms at incisive.

adj. Caustic; cutting: trenchant criticism.

adj. Distinct; clear-cut.

adj. Fitted to trench or cut; gutting; sharp.

adj. Keen; biting; vigorously effective and articulate; severe; as, trenchant wit.

adj. Fitted to trench or cut; gutting; sharp.

adj. Fig.: Keen; biting; severe.

Cutting; sharp; keen.

Penetrating; energetic; downright.

Specifically, in zoology, sectorial, as a molar or premolar; sharp-edged: as, the trenchant canines of a saber-toothed tiger.

adj. clearly or sharply defined to the mind

adj. characterized by or full of force and vigor

adj. having keenness and forcefulness and penetration in thought, expression, or intellect

"Throughout the book, Seife's practiced journalist's eye results in trenchant nonmathematical observations."

clear    efficacious    effectual    effective    intelligent   

gutting    sharp    biting    severe    energetic   

penchant   

incisive    epigrammatic    scathing    caustic    succinct    forceful    cogent    pithy    curt    lucid