haven't a clue
- cluelessLacking any understanding
- baffledUtterly unable to understand
- puzzledConfused by something unclear
- stumpedUnable to solve
- lostUnable to navigate
confused · bewildered · mystified · perplexed · blank · drawing a blank · no idea · oblivious · shrug · uncertain · foggy · in the dark · at a loss · guessing · searching · dunno · beats me · riddle
knowledge/understanding
haven't a cluewell-informed
Having much knowledge
crystal clear · in the know · cognizant · enlightened · clued in
competence/capability
haven't a clueexpert
Highly skilled practitioner
master · know one's stuff · proficient · adept · skilled