Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Thinkable \Think"a*ble\, a.
Capable of being thought or conceived; cogitable.
--Sir W.
Hamilton.
Douglas Harper's Etymology Dictionary
1805; see think (v.) + -able. Possibly a back-formation from unthinkable.
Wiktionary
a. 1 Able to be thought or imagined; conceivable; feasible or possible. 2 Morally acceptable or legal (rare).
WordNet
adj. capable of being conceived or imagined or considered [ant: unthinkable]
Usage examples of "thinkable".
Before such measures as limitation of incomes become even thinkable, there will have to be a complete shift of power away from the old ruling class.
When a concrete thinkable one fell to him, he was jubilant over the isolate thing, and with his joy value had nothing to do.
Ashla, some, with less strength, might come to know Bogan, the dark side, and bring un- thinkable suffering to the Universe.
Every muscle ached and, over and above it all, there was the scarcely thinkable throbbing at the back of his skull.
The conversation had disturbed Vicky more than she realized, and although-she was exhausted by the long hard driven day, she could not sleep, but lay restlessly under a single blanket on the hard sun-warmed earth, considering the wicked and barely thinkable thoughts that the girl had sown in her mind.
If this was so, the implications were unthinkable, so Craig forced himself to put his doubts aside.
If however you talk of a great yet finite and thinkable being, a being not myself, extending beyond my imagination in time and space, knowing all that I can think of as known and capable of doing all that I can think of as done, you come into the sphere of my mental operations, and into the scheme of my philosophy.
I Last year I called this world of gain-givings The darkest thinkable, and questioned sadly If my own land could heave its pulse less gladly, So charged it seemed with circumstance whence springs The tragedy of things.
In the dreary fluxations of space travel he prepared renditions of the essay in all the remaining dialects of Earth, since the nullification could not be considered complete until every thinkable center of imaginative notions had been uncentered.
Gravity's the weaker by too many orders of magnitude to make a relationship thinkable.
To protest ground rents and the oppression that makes them thinkable, we Zenarchists believe in chanting and writing as often as possible this powerful mantra: Permanent Universal Rent Strike.