Plaintive

pain + tick
meaning - expressing sorrow

Putrid

Putrid = Put (put-off) + rid (rotten)

meaning - decayed and having an unpleasant smell

connotation - negative

pic - get rid of that putrid smell from that decomposed bird

Precocious

Precocious = Pre + cocious (concious)
predicting before concious is premature

meaning - showing unusually early mental development or achievement

pic - Dexter is a precocious boy, early mental development