'Thinkable' definitions:

Definition of 'thinkable'

From: WordNet
adjective
Capable of being conceived or imagined or considered [ant: unthinkable]

Definition of 'Thinkable'

From: GCIDE
  • Thinkable \Think"a*ble\, a. Capable of being thought or conceived; cogitable. --Sir W. Hamilton. [1913 Webster]

Synonyms of 'thinkable'

From: Moby Thesaurus