undereffective

English

Etymology

under- +‎ effective

Adjective

undereffective (comparative more undereffective, superlative most undereffective)

1. Not effective enough.
   • 2007 May 10, Joe Lapointe, “Yanks Work Through Problems to Get Back to .500”, in New York Times‎^[1]:

     The bullpen, overworked and undereffective in the first month, contributed three scoreless innings as five relief pitchers worked as if they were sprinters handing off a baton in a relay race.