Full of facts; containing many accurate details or information.
From fact (Latin factum) + -ful (Old English suffix meaning 'full of'). A straightforward English formation following the pattern of 'hopeful,' 'careful,' etc.
Unlike 'factious' (which means divisive), 'factful' means rich in actual data — it's the positive descriptor for well-researched writing, though it's rarely used because we prefer just saying 'accurate' or 'detailed.'
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