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