The Collaborative International Dictionary of English v.0.48:
Intelligibly \In*tel"li*gi*bly\, adv. In an intelligible manner; so as to be understood; clearly; plainly; as, to write or speak intelligibly. IntemerateWordNet (r) 3.0 (2006):
intelligibly adv 1: in an intelligible manner; "the foreigner spoke to us quite intelligibly" [syn: intelligibly, clearly, understandably] [ant: unintelligibly, ununderstandably]