WordWeb Online

1. Not enthusiastic; lacking excitement or ardour
   - unenthusiastic, unenthused
    
2. Arousing no interest, attention, curiosity or excitement
   - uninteresting, lame, lameo [informal], uninspiring

1. Expresses indifference or lack of enthusiasm or interest

See also: boring, cold, deadening, deadly [informal], draggy [informal], dull, earthbound, halfhearted, half-hearted, ho-hum [informal], insipid, interest, interestingness, irksome, jejune, lukewarm, mind-numbing, narcotic, passionless, pedestrian, ponderous, prosaic, prosy, putdownable, slow, soporiferous, soporific, spiritless, tedious, tepid, tiresome, unamusing, unexciting, unstimulating, wearisome, wishy-washy [informal]

Encyclopedia: Meh