Embittered rhymes with:
frittered, glittered, littered, pittard, administered, altered, astred, attard, bantered, bartered, bastard, battered, bettered, blistered, bolstered, bustard, buttered, catered, centered, chartered, cloistered, clustered, cluttered, countered, cratered, custard, doctored, encountered, entered, factored, faltered, festered, fettered, filibustered, filtered, flattered, flustered, fluttered, fostered, frittered, glittered, guttered, headquartered, hotard, lettered, littered, martyred, mastered, mattered, mentored, metered, monitored, mustard, mustered, muttered, neutered, pattered, pestered, petard, petered, pittard, plastered, reentered, registered, scattered, sequestered, shattered, sheltered, shuttered, slaughtered, spattered, splattered, splintered, sputtered, sweltered, tattered, teetered, tutored, unaltered, unchartered, uncluttered, unfettered, unfiltered, unregistered, upholstered, uttered, watered, wintered