Here's what rhymes with halfmirthful.
mirthful Words that almost rhyme with halfmirthful
hurtful myrtle forkful circle journal thermal verbal colonel fertile purple kernel girdle turtle dermal hurdle sternal vernal gurgle curdle hurtle burble burgle internal eternal maternal diurnal infernal servile squirrel inertial infertile encircle scleral chervil demurral commercial external paternal referral fraternal nocturnal nonverbal tubercle isothermal semicircle deferral subdural conferral reversal rehearsal dispersal epidermal epidural geothermal illiberal puerperal bicameral clitoral infomercial transferal disbursal universal hydrothermal transversal noncommercial controversial noncontroversial