(1):

(superl.) Abounding with sap; full of sap; juicy; succulent.

(2):

(superl.) Hence, young, not firm; weak, feeble.

(3):

(superl.) Weak in intellect.

(4):

(superl.) Abounding in sap; resembling, or consisting largely of, sapwood.

(5):

(a.) Musty; tainted.