portrait of cheerful man feeling amused by his lack of knowledge

portrait cheerful man amused entertained happy smiling joyous upbeat radiant perplexed hesitant confused unsure stumped puzzled answer skeptical person questioning isolated doubtful undecided vague ambivalent unclear ambiguous equivocal indecisive suspicious insecure torn uncommitted unconvinced equivocating hesitating noncommittal wavering oscillating undetermined doubting reluctant circumspect conflicting unknown unconfirmed debatable unpredictable indeterminate undefined unforeseeable questionable sketchy doubt mystified