undiscovered (adj.) undisclosed (adj.) undisciplined (adj.) undine (n.) undiminished (adj.) undiluted (adj.) undignified (adj.) undigested (adj.) undifferentiated (adj.) undies (n.) undeviating (adj.) undeveloped (adj.) undeterred (adj.) undetermined (adj.) undetected (adj.) undetectable (adj.) undesirable (adj.) undeserving (adj.) undeserved (adj.) underwriter (n.)