Impressive
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unexpansive, humble, normal, weak, ugly, indecisive, dull, inefficacious, inglorious, undignified, moderate, unamazing, ineffective, disgusting, unassertive, relaxed, unreliable, poor, undramatic, insignificant, unimposing, inconsequential, cool, incredible, cold, unthinkable, mild, trivial, doubtful, unceremonious, commonplace, improbable, unremarkable, unpersuasive, ineffectual, unsensational, unobserved, lowborn, dubious, ordinary, deadpan, inconceivable, detached, common, uncontrolling, dispassionate, little, easy, uneffective, boring, small, unimportant, inferior, unlikely, unemotional, facile, unbelieveable, unimpressive, unconvincing, expected, unexciting, ignoble, usual, implausible, unaffecting, emotionless, informal, lyric.