keen, calculating, perspicacious, acute, astute 1. He has an _____ awareness of the slightest ambiguity in each statement made by his opponent. 2. The professor gave an ______ evaluation of the gaps in our knowledge of how life evolved. 3. He is a ______businessman. 4. This is a ______ remark that illuminated the whole problem for all of them. 5. He has a _____ mind for distinctions.