Optimistic rhymes with:
euphemistic, pessimistic, euphemistic, mistic, mystic, pessimistic, altruistic, anachronistic, antagonistic, antiballistic, artistic, atheistic, autistic, ballistic, capitalistic, characteristic, chauvinistic, christic, coloristic, cystic, deterministic, dualistic, euphemistic, expressionistic, fatalistic, feudalistic, futuristic, hedonistic, hellenistic, heuristic, holistic, humanistic, idealistic, imperialistic, impressionistic, individualistic, jelisic, jingoistic, journalistic, legalistic, linguistic, logistic, materialistic, mechanistic, militaristic, mistic, monopolistic, moralistic, mystic, narcissistic, nationalistic, naturalistic, novelistic, oligopolistic, opportunistic, pantheistic, paternalistic, patristic, pessimistic, pluralistic, polytheistic, primitivistic, propagandistic, pugilistic, puristic, realistic, relativistic, ritualistic, sadistic, sensationalistic, simplistic, sistek, socialistic, stalinistic, statistic, stylistic, surrealistic, synergistic, terroristic, uncharacteristic, unrealistic, voyeuristic