Dictionary
un•be•liev•a•ble
Pronunciation: (un"bi-lē'vu-bul), [key]—
adj.
1. too dubious or improbable to be believed:
an unbelievable excuse.
2. so remarkable as to strain credulity; extraordinary:
the unbelievable fury of the storm; an unbelievable athlete. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.