Did the idiot seem suspicious of you?
No, he was clueless.
Could I use "clueless" here to mean he didn't suspect anything at all in a harsh way? If not, what else could I say?
"clueless" is not complimentary, but it's not harsh either. I think you're safe with "clueless". CJ
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"clueless" is not complimentary, but it's not harsh either.
I think you're safe with "clueless".
CJ