improperadjective · Level 2 SAT1Not appropriate, suitable, or becomingThe committee found it improper for the official to vote on matters affecting his own firm.ModuleLevel 2Registeracademic, contrast, toneCollectionCollection 028SAT Plus planAlso in Collection 028supercilious, unbecoming, untoward, dissentious, illegitimate, laudable, unlawful, fervent and 1 more