1. (of a taste or smell) stinging; sharp
1. The burning clothes filled the air with a pungent smoke.
2. The editor filled the margin of my manuscript with pungent comments.
pungere (to prick, stab) (Latin)
pun-punch+agent, punch a agent he is strong and sharp pun + (negli)gent: As you know punning means playing with words. So if we pun negligently on others it may hurt/wound them.