know-it-alln.adj.

1849 U.S. Mag. & Democratic Rev. Dec. 523 That inimitable air, which only can be described by the new compound of ‘I-know-it-all’.]

1873 W. Denton Soul of Things II. i. 11 They have been told by these Marianne-Island know-it-alls, that what could not be seen from the highest peak of the Physical-Science Islands could not be of the slightest importance to the dwellers thereon.

1882 W. Virginia School Jrnl. Feb. 12/1 The pedantic, or, as the members of this class would say, the pedantical..are classified as Popular Skimmers, Easy Goers, Know-it-Alls and Sanctimonious Pretenders.

1895 Outing 27 65/1 I have no desire to send a young know-it-all to the shop.

1965 G. McInnes Road to Gundagai ii. 30 He had no time for ‘skites’, that is, boastful know-it-alls.

2001 N.Y. Rev. Bks. 20 Dec. 8/2 The country stubbornly refused to follow the script being written by the political know-it-alls.

1883 Daily Miner (Butte, Montana) 31 Aug. These over-cautious, know-it-all, beg-leave-to-differ people are not the kind who set even a small part of the world on fire.

1935 P. G. Wodehouse Blandings Castle ix. 225 These know-it-all directors make me tired.

1956 H. Gold Man who was not with It (1965) ii. 16 He looked over the apprehensive afternoon crowd with its know-it-all faces.

1974 Times 23 Jan. 1/8 We didn't realize, until it was too late, how our know-it-all attitude was undermining the self-assurance of parents.

2003 Muscle & Fitness Jan. 22/1 Tired of misinformation from old-style, overtraining, know-it-all gym rats, I turned to your magazine as an alternative.