Here's what rhymes with semifacetiously.
facetiously speciously Words that almost rhyme with semifacetiously
grievously zealously ceaselessly heedlessly seamlessly covetously legally secrecy speedily fealty needlessly serenely sleepily reapply regally feasibly cheekily speechlessly heedfully sleeplessly sneakily deity appreciably illegally greedily peaceably regency dreamily realty genially piquancy drearily egregiously obscenely peony phonemically needfully piquantly creakily creepily wheezily squeakily anemically creamily sleazily frequency frequently recently agreeably decency peacefully supremely decently ingeniously uneasily unequally unevenly aridity coherently gleefully ideality leniency unspeakably leniently deceitfully breezily dubiety conceitedly greasily inappreciably queasily coequally obesity conceivably inconceivably naivety irredeemably heterogeneously believably centripetally conveniently infrequently unfrequently indecency unbelievably benignity disagreeably inconveniently infrequency indecently congenially indefeasibly unrelievedly homogeneity spontaneity historicity irretrievably heterogeneity crystallinity simultaneity contemporaneity