1918 P. Blanchard in Amer. Jrnl. Psychol. Apr. 163 Jung's hypothesis of the two psychological types, the introvert and extrovert,—the thinking type and the feeling type.

1920 Times Lit. Suppl. 1 Apr. 205/4 The external always throws him [sc. George Herbert] back into himself, and then his thoughts turn outwards for confirmation... He is, in the language of modern psychology, both introvert and extrovert, yet never an egotist.

1920 Challenge 21 May 44/2 An extrovert soldier faced with the problem of escape from war conditions.

1926 W. McDougall Outl. Abnormal Psychol. 440 The characteristic neurosis of the extrovert is hysteria, while that of the introvert is neurasthenia or psychasthenia.

1957 Times Lit. Suppl. 20 Dec. 774/1 Practical and shrewd, irascible and extrovert, he dominated the college from 1792 to 1834.

1968 Autocar 25 Jan. 8/1 Certainly not a budget car, this..is already gaining a name as a noisy, successful little extrovert.

1923 Westm. Gaz. 21 Mar. Any one of these will display either the introverted or the extroverted attitude.

1925 C. Fox Educ. Psychol. 254 The first is called the extroverted type, because in the main he goes outside himself to the object.

1930 Music & Lett. 11 i. 45 One might expect the temperamental incompatibility to exist only between romantic composers and an extroverted nation.

1958 P. Tanner in P. Gammond Decca Bk. Jazz xi. 138 It is also a happy extroverted music, making up in warmth what it may often lack in subtlety.

1946 W. S. Knickerbocker 20th Cent. Eng. 388 Prufrock is the antithetical brother of Eliot's Sweeney, whose extrovertish animalism functions equally without benefit of an ethic.

1671 J. Webster Metallographia xii. 197 The external and combustible Sulphur..is..protruded and extroverted.

1804 A. Knox Let. 13 Mar. in J. Jebb & A. Knox Thirty Years' Corr. (1834) I. 102 Every idea that could, even by possibility, extrovert the thought.