The Collaborative International Dictionary of English v.0.48:
Fathomable \Fath"om*a*ble\, a. Capable of being fathomed. [1913 Webster]WordNet (r) 3.0 (2006):
fathomable adj 1: (of depth) capable of being sounded or measured for depth [syn: fathomable, plumbable, soundable] [ant: unfathomable] 2: (of meaning) capable of being penetrated or comprehended