lackluster

adj

1. tasteless, bland, insipid, jejune, flat, dull, vapid, Sl. nothing, Sl. blah; uneventful, humdrum, monotonous, ordinary, run-of-the-mill, commonplace, prosaic, matter-of-fact; tedious, tiresome, boring, boresome, wearisome, uninteresting, Sl. dead, dry, dry-as-dust.

2. dingy, dark, dim, dun, dusky; drab, dismal, dreary, cheerless; colorless, tarnished, faded, washed-out; deadened, dulled, muted, muffled; shadowy, gloomy, tenebrous, obscure; murky, hazy; smutchy, dirty, grimy, soiled, muddy; shabby, seedy, worn, run-down, sloppy, crummy.

3. unresponsive, passionless, indifferent, uncaring; sluggish, phlegmatic, lethargic, torpid, heavy, lifeless; languid, listless, spiritless, apathetic; inactive, inert, stagnant; lazy, oscitant, drowsy.

4. unimaginative, undiscerning, unintelligent, witless, slow-witted, dull-witted; dense, thick-headed, Inf. thick, slow, stupid; backward, doltish, simple; empty-headed, vacuous.