geekishadj.

1950 [implied in: J. Kerouac Town & City ii. iii. 370 You have occasional visions of horror, feelings of spiritual geekishness—Don't you see, everybody feels like that now. (at geekishness n.)] ].

1959 A. Ginsberg Kaddish & Other Poems (1961) 41 Mind eats its flesh in geekish starvation.

1993 Esquire June 63/1 His first auditors will turn up in the later cities and discover..the geekish didacticism of the mentally bankrupt.

2001 Time 2 Apr. (Interface section) 3/3 The Apple Titanium Powerbook is one of those beauties: a powerful machine that fulfills all of our geekish needs, stuck inside a case that makes grown men weep in aesthetic awe.

1993 I. M. Banks Against Dark Background 150 Men who were vastly more moodily interesting and intellectually stimulating than cousin Geis, the part-time Navy goon and geekishly successful businessman.

2001 Wired Apr. 189/1 ‘Your mind becomes like a bad Windows system running too many background processes,’ he told me geekishly.