Apishly is an adjective that suggests behaving like an ape, or with marked stupidity or foolishness. Some synonyms of apishly include foolishly, idiotically, senselessly, stupidly, imbecilically, brainlessly, heedlessly, mindlessly, and moronically. Other synonyms highlighting the foolish and senseless behavior are asinine, buffoonish, clownish, doltish, oafish, and witless. These words describe an individual who acts in a manner that is not quite intelligent or thoughtful. They convey a sense of behavior that is lacking in grace or intelligence, often involving an inability to perceive important information or react appropriately to a situation.