Lustless

Origin

lust + -less

Full definition of lustless

Adjective

1. Without sexual lust.
• 1587, Christopher Marlowe, Tamburlaine the GreatBy Mahomet my kinsman's sepulchre,
  And by the holy Alcoran I swear,
  He shall be made a chaste and lustless eunuch...
• 1964, J Z Eglinton, Paul Goodman, Greek LoveBut then, Bergler also claims that there are no genuinely ambi-erotic individuals, only "homosexuals who may be capable of lustless mechanical sex...
2. (obsolete) Lacking vigour; weak; spiritless.