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Definition of overweening : 1. Conceit; arrogance.
2. Unduly confident; arrogant; presumptuous; conceited.

Synonyms:

undue, uppity, profligate, prideful, riotous, exuberant, inordinate, egotistic, prodigal, superior, ebullient, extravagant, lush, luxuriant, proud, high-and-mighty, unreasonable, supercilious, unrestrained, insolent, excessive, attitude, immodest, high-spirited, spendthrift, profuse, lofty, lordly, haughty, arrogant, overbearing

Usage examples:

• I could scarcely leave the hall in my overweening pleasure, and yet it would have beseemed me far better to share the sufferings of the crucified Saviour." - "The Complete Historical Romances of Georg Ebers", Georg Ebers.
• For it will not even do to say, that he dreaded the involving the city in war, by seizing Nicanor, and hoped by professions of confidence and just- dealing, to retain him in the observance of the like; but it was, indeed, his credulity and confidence in him, and an overweening opinion of his sincerity, that imposed upon him. - "Plutarch-Lives-of-the-noble-Grecians-and-Romans", Clough, Arthur Hugh.
• If so, it seems as if he might have had, in his earlier days, an overweening opinion of his own abilities. - "A Book of Golden Deeds", Charlotte M. Yonge.