Synonyms of clueless

1 Syllable
shook, thrown, lost, stuck
2 Syllables
rattled, puzzled, stumped, floored, mind-blown, dopey, baffled, doubtful, foggy, unglued
3 Syllables
mystified, bollixed, perplexed, nonplussed
4 Syllables
simpleminded, bewildered
6 Syllables
discombobulated