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| titan of thought (Olga Okuneva); giant in thought (Ремедиос_П) | |||
| brainiac (SGints); braniac (SGints) | |||
| giant among thinkers (Ilya Ilf and Yevgeny Petrov, The Twelve Chairs, ch. 14. Used only ironically. VLZ_58) | |||
| mental giant (Comment by ART Vancouver: Correct, here's a quote where this is used: ": Plenty of successful people are far from mental giants." – Raymond Chandler) | |||