adj. 25B6; adjective
an indifferent shrug : UNCONCERNED, uninterested, uncaring, casual, nonchalant, offhand, uninvolved, unenthusiastic, apathetic, lukewarm, phlegmatic; unimpressed, bored, unmoved, unresponsive, impassive, dispassionate, detached, cool.
an indifferent performance : MEDIOCRE, ordinary, average, middling, middle-of-the-road, uninspired, undistinguished, unexceptional, unexciting, unremarkable, run-of-the-mill, pedestrian, prosaic, lacklustre, forgettable, amateur, amateurish; informal OK, so-so, fair-to-middling, no great shakes, not up to much; Brit. informal not much cop; N. Amer. informal bush-league; NZ informal half-pie.
enthusiastic, brilliant.