Definify.com

Webster 1913 Edition

Adj.

Capable of being spoken; fit to be spoken.

Ascham.

Able to speak.

Milton.

Adj.

That can be spoken.

Having the power of speech.

speakable ‎(not comparable)

That can be spoken; utterable, verbalizable.
Acceptable as a topic of discussion; not subject to taboo.
- 2004, Robert I Yufit, David Lester, Assessment, Treatment, and Prevention of Suicidal Behavior
  Once the group knows that suicide is a speakable topic...