acute

Synonyms: astute canny clever discerning discriminating incisive ingenious insightful intense intuitive judicious keen observant penetrating perspicacious piercing quick-witted sensitive sharp smart subtle

Antonyms: dense imperceptive insensitive obtuse slow stupid

Synonyms: afflictive critical crucial dangerous decisive desperate dire essential grave serious severe sudden urgent vital

Antonyms: not serious unimportant

Synonyms: cutting distressing excruciating exquisite fierce keen overpowering overwhelming piercing poignant powerful racking severe sharp shooting stabbing sudden violent

Synonyms: acicular aciculate acuminate acuminous cuspate cuspidate knifelike needle-shaped peaked piked pointed sharpened spiked

Antonyms: blunt dull