Part of speech:
An incompetent person; esp., one who is mentally deficient
(Slang) A person regarded as, variously, pitifully inept, ineffective, shy, dull, etc.
Of relatively little weight; not heavy:
Not experiencing the effects of gravity.
(Archaic) A monkey
Find another word for lightweight. In this page you can discover 18 synonyms, antonyms, idiomatic expressions, and related words for lightweight, like: incompetent, bungler, stupid person, nebbish, failure, fool, consequential, important, heavyweight, big and major.