Of a weapon, etc.: sharp-pointed; keen.
Neat; eloquent; applicable; relevant.
A poignant reply will garner more credence than hours of blown smoke.
Evoking strong mental sensation, to the point of distress; emotionally moving.
Flipping through his high school yearbook evoked many a poignant memory of yesteryear.
Of a smell or taste: piquant, pungent.
Of a look, or of words: incisive; penetrating; piercing.
His comments were poignant and witty.
Inducing sharp physical pain.