Definify.com

Webster 1913 Edition

Adj.

Without ears; hence, deaf or unwilling to hear.

Pope.

Adj.

Destitute of ears; disinclined to hear or listen.

earless ‎(not comparable)

Lacking ears.
- 2013 May-June, William E. Conner, “An Acoustic Arms Race”, in American Scientist, volume 101, number 3, page 206-7:
  Earless ghost swift moths become “invisible” to echolocating bats by forming mating clusters close (less than half a meter) above vegetation and effectively blending into the clutter of echoes that the bat receives from the leaves and stems around them.
Earless seals are probably more hydrodynamic without ear lobes.‎

lacking ears