Strong's H8602 · Hebrew

taphel

taw-fale'

from an unused root meaning to smear; plaster (as gummy) or slime; (figuratively) frivolity

Scholarly Lexicons

Brown-Driver-Briggs (BDB)

 H8602a תָּפֵל tasteless , unseasoned ; fig. of unsatisfying prophecies H8602b תָּפֵל whitewash ;—applied to wall  

Brown-Driver-Briggs Hebrew Lexicon (BDB), 1906 — public domain