Here's what rhymes with underachieving.
achieving peeving leaving weaving heaving thieving riving bereaving reeving sheaving receiving believing perceiving deceiving grieving cleaving unbelieving overachieving aggrieving relieving conceiving retrieving interweaving interleaving undeceiving reprieving disbelieving misconceiving preconceiving Words that almost rhyme with underachieving
teasing appeasing piecing teething beefing breathing pleasing seizing ceasing leasing briefing seething sheathing wheezing leafing wreathing phishing reefing breezing tyrannising vicing leashing iodising freezing policing unceasing sneezing bequeathing creasing unleashing unpleasing greasing energising fleecing naturalising anodising subleasing urbanising deceasing analogising decreasing releasing squeezing realising debriefing displeasing mobilising modernising apologising fertilising generalising moralising neutralising tantalising idealising liberalising unfreezing actualising eulogising internalising penalising subfreezing unsheathing fantasising mechanising mythologising channelising idolising verbalising federalising rhapsodising vandalising stylising surceasing nasalising novelising increasing organising emphasising utilising civilising specialising centralising socialising symbolising localising monopolising nationalising normalising sterilising brutalising evangelising finalising fraternising legalising marginalising refreezing vitalising immobilising immunising metabolising personalising predeceasing scandalising commercialising feminising initialising nonfreezing vocalising cannibalising pluralising alkalising anthologising fossilising routinising palatalising recognising stabilising demoralising equalising rationalising globalising humanising synthesising visualising capitalising externalising formalising materialising canalising hypothesising immortalising radicalising solemnising trivialising vulcanising attitudinising demobilising memorialising signalising volatilising womanising devitalising marbleizing metastasising serialising westernising emotionalising hospitalising destabilising reorganising scrutinising conceptualising decentralising dehumanising disorganising galvanising homogenising revitalising universalising criminalising denationalising depersonalising overemphasising editorialising fictionalising overgeneralising industrialising individualising contextualising internationalising intellectualising professionalising sentimentalising sensationalising conventionalising decriminalising recapitalising pedestrianising institutionalising compartmentalising photosynthesising departmentalising being teaching dealing appealing beating cheating peering beaming peeling peeping teeming deeming jeering peaking beading pealing peeking teaming beaching beeping peeing cheeping deeding teeing cheeking piquing beaning geeing pieing piing feeling meaning leading meeting speaking hearing keeping reaching seeing seeking bleeding feeding healing heating preaching treating breeding ceiling leaning seeming dreaming kneeling needing pleading stealing weeping annealing leaping sealing seating speeding steaming bleaching fatiguing leaching leaking reaping reeling seeding weaning weeding wheeling ceding heaping heeding keying kneading reeking seeping sheeting breaching reviling steeping wreaking beetling esteeming heeling keening preening reaming tweaking untying leeching seaming steeling chinning weening bleeping keeling leaguing perilling spiting treeing hieing kneeing retying uprearing spieling tweeting weeing proceeding sleeping cleaning competing repeating sweeping yielding agreeing creeping greeting streaming defeating fleeing fleeting freeing gleaming redeeming shielding besieging creaking deleting endearing feasting machining scheming seedling shrieking skiing sneaking wielding beseeching demeaning impeding repealing unfeeling unmeaning acceding careening defiling fielding gleaning greening imbibing needling streaking unappealing unseeing weakling bespeaking congealing creaming freaking impeaching stampeding strewing striping wheedling underfeeding unseating beseeming faceting reteaching unsealing queening sleeting unreeling chivvying skying sleeking valeting weaseling chivying mitring alibiing preceding completing exceeding intervening revealing screening succeeding intriguing screaming concealing receding retreating conceding overseeing secreting unyielding convening depleting entreating inbreeding overeating overheating overweening rereading screeching sightseeing squeaking squealing unreasoning unvarying critiquing decreeing interbreeding overhearing overreaching preheating rehearing reheating seceding calcining interceding maltreating overfeeding imperilling reseeding crisping noncompeting relining resealing sidelining guillotining nonspeaking refiling pinwheeling pureeing bestrewing emceeing hosteling misspeaking obsoleting restring disesteeming misdealing chagrining rosining misleading guaranteeing disagreeing foreseeing misreading superseding safekeeping concreting supervening farseeing mistreating refereeing cartwheeling leafleting oversleeping phantasying reburying receipting squeegeeing trampolining nonyielding crossbreeding excreting inveigling quarantining reconvening calcimining garnisheeing fricasseeing silkscreening