What does "insipid" mean?

Insipid: Wanting in spirit, life, or animation; uninteresting; weak; vapid; flat; dull; heavy; as, an insipid woman; an insipid composition. Flat, insipid, and ridiculous stuff to him. South. But his wit is faint, and his salt, if I may dare to say so, almost insipid. Dryden.