keen

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”

intense or sharp

• “suffered exquisite pain”
• “felt exquisite pleasure”

very penetrating and clear and sharp in operation

• “an incisive mind”
• “a keen intelligence”
• “of sharp and active intellect”

very good

• “he did a bully job”
• “a neat sports car”
• “had a great time at the party”
• “you look simply smashing”

as physically 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”

having a sharp cutting edge or point

• “a keen blade”

a funeral lament sung with loud wailing

express grief verbally

• “we lamented the death of the child”