having or demonstrating ability to recognize or draw fine distinctions;
"an acute observer of politics and politicians" "incisive comments" "icy knifelike reasoning" "as sharp and incisive as the stroke of a fang" "penetrating insight" "frequent penetrative observations"
painful as if caused by a sharp instrument;
"a cutting wind" "keen winds" "knifelike cold" "piercing knifelike pains" "piercing cold" "piercing criticism" "a stabbing pain" "lancinating pain"