Synonyms of not have a clue in English:

not have a clue


See definition of have a clue

phrase

1‘I didn't have a clue what was happening’

SYNONYMS
have no idea, not have any idea, be ignorant, not have an inkling
be puzzled, be perplexed, be bewildered, be baffled, be mystified, be at a loss, be at sea, be all at sea
informal be clueless, not have the faintest