Hebrew

hll - to be infatuated; to make look foolish; (po.) to make a mockery of; (hitpo.) to pretend to be mad; to act like a madman (HALOT 249)

PS
*hll - to be imbecile, weak-minded, mad; be mocked at (SED I No. 19ᵥ)
Originally rather a biconsonantal stem. Note various ways of triconsonantization in Eth. and a full reduplication in Arb. and Soq.