Sappy

·adj Musty; tainted.

II. Sappy ·superl Weak in intellect.

III. Sappy ·superl Hence, young, not firm; weak, feeble.

IV. Sappy ·superl Abounding with sap; full of sap; juicy; succulent.

V. Sappy ·superl Abounding in sap; resembling, or consisting largely of, sapwood.

sappy
Young; not firm; weak.--Johnson. Weak in intellect.--Webster. Used only in familiar language. ...

Dictionary of American Words And Phrases by John Russell Bartlett.