The Collaborative International Dictionary of English v.0.48:
Speakable \Speak"a*ble\, a. 1. Capable of being spoken; fit to be spoken. --Ascham. [1913 Webster] 2. Able to speak. --Milton. [1913 Webster]WordNet (r) 3.0 (2006):
speakable adj 1: capable of being uttered in words or sentences [syn: speakable, utterable]