Here's what rhymes with unpositivistic.
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flyspeck civic acidic citric lipstick pacific physic cynic lytic thymic dipstick diptych sylphic specific critic lyric terrific mimic mythic parasitic picnic cryptic elliptic arthritic lithic gimmick saprophytic triptych periwig nitpick zoophytic analytic clinic rhythmic apocalyptic catalytic hemolytic acrylic ecliptic granitic horrific hydrophilic idyllic limbic paralytic rabbinic satiric syphilitic basophilic haemolytic hydrolytic metaphysic porphyritic arrhythmic nephritic pinprick philippic juridic nonspecific prolific dendritic hemispheric phenotypic proteolytic empiric honorific impolitic unspecific bulimic cenobitic bromidic scientific intrinsic extrinsic monolithic antiarrhythmic carboxylic eosinophilic neolithic thrombolytic antisemitic patronymic stratospheric hermaphroditic palaeolithic pantomimic encephalitic transpacific nonrhythmic psychoanalytic logarithmic electrolytic unscientific algorithmic cataclysmic fibrinolytic hieroglyphic organismic megalithic paleolithic polyclinic coenobitic nonscientific