Definition of "incredulous"

Xodar listened in incredulous astonishment to my narration of the events which had transpired within the arena at the rites of Issus.

1913 January–May, Edgar Rice Burroughs, “The Gods of Mars”, in The All-Story, New York, N.Y.: Frank A. Munsey Co.; republished as “A Break for Liberty”, in The Gods of Mars, Chicago, Ill.: A[lexander] C[aldwell] McClurg & Co., 1918 September, page 191

In safe flats and dark restaurants, never the same one twice, we ate quiet meals, exchanged our goods and gazed upon each other with the incredulous contentment that passes between mountaineers when they are standing on the peak.

1986, John le Carré, A Perfect Spy

Reactions at Sun's campus, an hour's drive from San Francisco, ranged from the fearful to the incredulous.

2009 March 18, Reuters, “Sun Micro Troops Fearful, Incredulous About IBM”, in Wired.com‎, archived from the original on 30 June 2013

Why euery thing adheres togither, that no dramme of a scruple, no scruple of a scruple, no obstacle, no incredulous or vnsafe circumstance […] .

c. 1601–1602 (date written), William Shakespeare, “Twelfe Night, or What You Will”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act III, scene iv]

Faced with these facts, we find it incredulous that [the] defendant had any intent other than the armed robbery of the service station.

1984, Supreme Court of Illinois, opinion in People v Terrell, 459 N.E.2d 1337, quoted in David C. Brody, James R. Acker, and Wayne A. Logan, Criminal Law, Jones & Bartlett Publishers (2001), page 564