in·effective I. \|in+\adjective Etymology:in- (I) + effective 1.: not producing or incapable of producing an intended effect < ineffective remedy > 2.: not capable of performing the required work or duties : incapable < ineffective figurehead > < ineffective troops > 3.: lacking in aesthetic merit < ineffective design > • in·effectively\“+\adverb • in·effectiveness\“+\noun II. noun : an ineffective person or thing : one unfit for service (as in an army)