MARVELLOUS
improbable, marvelous, marvellous, tall
(adjective) too improbable to admit of belief; “a tall story”
marvelous, marvellous, miraculous
(adjective) being or having the character of a miracle
fantastic, grand, howling, marvelous, marvellous, rattling, terrific, tremendous, wonderful, wondrous
(adjective) extraordinarily good or great; used especially as intensifiers; “a fantastic trip to the Orient”; “the film was fantastic!”; “a howling success”; “a marvelous collection of rare books”; “had a rattling conversation about politics”; “a tremendous achievement”
Source: WordNet® 3.1
Etymology
Adjective
marvellous (comparative more marvellous, superlative most marvellous)
(British spelling) Exciting wonder or surprise; astonishing; wonderful.
Source: Wiktionary