clueless[adjective]Synonyms: stupid, dim, dozy
(Brit. informal), dull, half-witted, simple, slow, thick, unintelligent, witless
[TahlilGaran] English Synonym Dictionary ▲
clue‧less /ˈkluːləs/
adjective informal having no understanding or knowledge of something – used to show disapproval
clueless about
Many teachers are clueless about the needs of immigrant students. [TahlilGaran] Dictionary of Contemporary English ▲