A primitive root; properly, apparently to be thick; figuratively, to be stupid -- be fat.
H2954. taphash
טָפַשׁ verb be gross (Late Hebrew Hithpa`el grow stupid, and derivatives; Aramaic טְפֵשׁ, for Hebrew שׁמן Isaiah 6:11, Ithpe`el be stupid; compare Assyrian ‰apâšu, be abundant, large, GuyJAS 1883, Août-Sept. 189) — metaphor לִבָּ֑ם כַּחֵלֶב טָפַשׁ Psalm 119:70 their heart is gross, like fat.