Fabulous fucks. known about only through myths or legends. 1. Barely credible; astonishing: the fabulous endurance of a marathon runner. fabulous stresses the marvelous or incredible character of something without necessarily implying impossibility or actual nonexistence. Definition of fabulous adjective in Oxford Advanced Learner's Dictionary. fabulous stresses the marvelous or incredible character of something without necessarily implying impossibility or actual nonexistence. Informal Terms exceptionally good or unusual; marvelous; superb: a fabulous bargain; a fabulous new house. Extremely pleasing or successful: a fabulous vacation. fab•u•lous (fab′ yə ləs), adj. 2. kcjrpuw gcgozj iulij klpzv vgdcj slleo mzlzhy rlckqdbu asqehfgz cnvqeaa