Unitary rhymes with:
sanitary, budgetary, depositary, sanitary, undersecretary, budgetary, cemetery, cometary, commentary, depositary, dietary, dignitary, dysentery, fragmentary, hereditary, interplanetary, involuntary, military, momentary, monastery, monetary, nonmilitary, paramilitary, pituitary, planetary, proprietary, salutary, sanitary, secretary, sedentary, solitary, tributary, undersecretary, unsanitary
Unitary sounds like:
under, underway, underwear, untrue