of only ordinary or moderate quality; neither good nor bad; barely adequate: The car gets only mediocre mileage, but it's fun to drive.Synonyms: undistinguished, commonplace, pedestrian, everyday; run-of-the-mill. Antonyms: extraordinary, superior, uncommon, incomparable.
not satisfactory; poor; inferior: Mediocre construction makes that building dangerous.Synonyms: meager, low-quality, second-rate; so-so. Antonyms: excellent, superior.
Origin: 1580–90; < Middle French < Latinmediocris in a middle state, literally, at middle height = medi(us)mid1 + OL ocris rugged mountain, cognate with Greekókris, akin to ákros apex; compare Umbrian ocar hill, citadel
1580s, from Fr. médiocre, from L. mediocris "of middling height or state," originally "halfway up a mountain," from medius "middle" (see medial) + ocris "jagged mountain" (cf. Gk. okris "peak, point," Welsh ochr "corner, border," L. acer "sharp;" see acrid).