1. sharp (knife, claws, etc.); pointed
猫の爪はとても鋭い。Cats' claws are very sharp.
2. sharp (pain, tone, etc.); acute; stabbing; cutting (remark, criticism, etc.); stinging; biting; fierce (attack); pointed (question, look, etc.); piercing (gaze); shrill (sound)
金属同士を鋭くぶつければこんな音がするだろう。If you strike two pieces of metal sharply against each other, this is the kind of sound you would hear.
3. keen (intuition, sense of smell, etc.); acute; sharp (eye, mind, etc.); astute; shrewd; discerning; penetrating (insight, question, etc.); perceptive
やはりみんな、感覚が鋭い。As expected, everyone has keen senses.