Here's what rhymes with overoptimistic.
mystic optimistic cystic ballistic artistic pessimistic statistic autistic dualistic logistic opportunistic sadistic theistic animistic hedonistic juristic monistic patristic chauvinistic sophistic realistic antagonistic stylistic unrealistic deterministic holistic idealistic journalistic mechanistic naturalistic altruistic anachronistic capitalistic atheistic communistic egoistic fatalistic pantheistic egotistic shamanistic surrealistic aphoristic euphemistic jingoistic pugilistic nepotistic puristic linguistic heuristic humanistic monopolistic simplistic moralistic paternalistic pluralistic ritualistic socialistic synergistic legalistic novelistic polycystic positivistic syllogistic cannibalistic eulogistic voyeuristic feudalistic inartistic belletristic casuistic nationalistic probabilistic narcissistic rationalistic futuristic impressionistic militaristic monotheistic polytheistic characteristic materialistic relativistic imperialistic oligopolistic expressionistic individualistic uncharacteristic universalistic spiritualistic sociolinguistic Words that almost rhyme with overoptimistic
flyspeck mimic mythic lipstick lytic dipstick diptych nitpick critic civic lyric terrific acidic picnic citric cryptic elliptic granitic pacific physic cynic lithic thymic gimmick triptych periwig sylphic specific analytic clinic rhythmic catalytic parasitic acrylic dendritic ecliptic idyllic limbic paralytic rabbinic satiric arthritic empiric honorific patronymic arrhythmic nephritic pantomimic pinprick juridic bromidic zoophytic scientific intrinsic apocalyptic hemolytic prolific horrific proteolytic syphilitic antiarrhythmic basophilic haemolytic hydrolytic impolitic metaphysic neolithic organismic thrombolytic antisemitic porphyritic saprophytic bulimic hermaphroditic philippic cenobitic nonrhythmic monolithic nonspecific hydrophilic phenotypic unscientific algorithmic megalithic unspecific palaeolithic coenobitic psychoanalytic extrinsic logarithmic electrolytic hemispheric carboxylic cataclysmic fibrinolytic stratospheric nonscientific paleolithic encephalitic transpacific polyclinic eosinophilic hieroglyphic