Modestine rhymes with:
celestine, notestine, agostini, anstine, castine, celestine, firestine, notestine, vastine, agostini, albertini, anstine, aseltine, balentine, ballentine, barentine, bertini, bettini, bottini, castine, celestine, contini, costantini, demartini, fantini, firestine, fortini, galentine, gallentine, gilbertine, latini, lentine, lentini, leontine, martini, montini, notestine, pettine, piacentini, ratieni, sabatine, sabatini, santini, teaney, teenie, teeny, turrentine, valentini, vantine, vastine, volentine
Modestine sounds like:
madhusudan, medication, medstone, midgetman, midsection, mitigation