sappy \sap"py\, a. compar. sappier; superl. sappiest.
   from 1st sap.
   1913 webster
   1. abounding with sap; full of sap; juicy; succulent.
      1913 webster

   2. hence, young, not firm; weak, feeble.
      1913 webster

            when he had passed this weak and sappy age.
                                                  --hayward.
      1913 webster

   3. weak in intellect. low
      1913 webster

   4. bot. abounding in sap; resembling, or consisting largely
      of, sapwood.
      1913 webster
see also:
sappier sappiest sap 

sappy
     adj 1: pungent adjectives of disesteem; "gave me a cockamamie
            reason for not going"; "wore a goofy hat"; "a silly
            idea"; "some wacky plan for selling more books" syn:
            cockamamie, cockamamy, goofy, silly, wacky,
            whacky, zany, unreasonable
     2: abounding in sap; "sappy maple trees"; "sappy kindling wood"
     also: sappiest, sappier
see also:
cockamamie cockamamy goofy silly wacky whacky 
zany unreasonable sappiest sappier 

sappiest
     see sappy
see also:
sappy