Having a tendency toward or characterized by thorough investigation and detailed scholarly inquiry.
From disquisition or disquire + -ive suffix, creating an adjective meaning 'inclined to disquisit' or 'characterized by thorough inquiry.'
This is what you'd call a 'disquisitive scholar'—someone naturally inclined to dig deep into subjects, though you'd be more likely to hear 'inquisitive' in modern English for the same idea!
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