1.
[syn: ineffably, indescribably, unutterably, unspeakably]
The Collaborative International Dictionary of English v.0.48:
Indescribably \In`de*scrib"a*bly\, adv.
In an indescribable manner; to a degree impossible to
desribe; as, indescribably beautiful.
[PJC]
WordNet (r) 3.0 (2006):
indescribably
adv 1: to an inexpressible degree; "she was looking very young
tonight, and, as usual, indescribably beautiful, in a
simple strapless dress of a green and white silky cotton"
[syn: ineffably, indescribably, unutterably,
unspeakably]