Here's what rhymes with briefest.
liefest chiefest Words that almost rhyme with briefest
bleakest leanest realest deepest cheapest regent weakest keenest leaflet leant meanest tliat cleanest neatest theist fleetest meekest sheerest reedit sleekest eagerest shiest sliest serest treatment recent sweetest easement peanut sicut piquant seulement steepest licit sealant preachment reshipped seafront serenest wiliest meagerest puniest chariest obscenest laciest agreement secret frequent decent bereavement decedent machinist sequenced bafflement completest gaudiest pointillist discreetest beechnut messiest paltriest corniest gamiest sultriest fruitiest uncleanest wintriest pastiest scaliest tangiest woodenest mousiest achievement appeasement antient defilement benignant sapient impalement orthopedist beguilement orthopaedist cajolement mangiest untidiest crispiest unwariest disagreement impeachment indecent infrequent sentient maltreatment pretreatment mendicant mistreatment disablement enfeeblement ennoblement pantomimist revilement regalement unmanliest convenient concealment intercollegiate enjambement unloveliest unhandiest underachievement insentient inconvenient inconvenienced