Here's what rhymes with unoptimistic.
mystic optimistic cystic ballistic artistic naturalistic pessimistic statistic anachronistic autistic dualistic logistic opportunistic sadistic theistic animistic hedonistic juristic monistic patristic chauvinistic sophistic realistic antagonistic stylistic unrealistic deterministic holistic idealistic journalistic mechanistic monopolistic altruistic capitalistic moralistic atheistic communistic egoistic fatalistic novelistic pantheistic egotistic shamanistic surrealistic aphoristic euphemistic jingoistic pugilistic overoptimistic nepotistic puristic linguistic heuristic humanistic nationalistic simplistic narcissistic paternalistic pluralistic ritualistic socialistic synergistic legalistic monotheistic polycystic positivistic syllogistic cannibalistic eulogistic voyeuristic feudalistic inartistic belletristic casuistic materialistic probabilistic rationalistic futuristic impressionistic militaristic polytheistic characteristic relativistic imperialistic expressionistic individualistic oligopolistic uncharacteristic universalistic spiritualistic sociolinguistic Words that almost rhyme with unoptimistic
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 monolithic nonspecific prolific horrific proteolytic syphilitic antiarrhythmic basophilic haemolytic hydrolytic impolitic metaphysic neolithic organismic antisemitic porphyritic bulimic hermaphroditic philippic cenobitic nonrhythmic hydrophilic phenotypic unscientific algorithmic thrombolytic megalithic saprophytic unspecific nonscientific palaeolithic encephalitic coenobitic extrinsic logarithmic electrolytic hemispheric carboxylic cataclysmic fibrinolytic stratospheric paleolithic transpacific polyclinic psychoanalytic eosinophilic hieroglyphic