1 informal Characterized by great enthusiasm for and knowledge about a particular subject, especially one of specialist or niche interest.
- ‘the most nerdish of hobbies’
- ‘the nerdish complexities of modern motorcycling terminology’
- ‘a real fan's nerdish attention to detail’
2 informal, derogatory Unfashionable and lacking in social skills or boringly studious.
- ‘a somewhat nerdish computer geek’
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