Prone to forgetting; having a tendency to forget things or neglect remembrance.
From 'forget' + '-ful' (suffix meaning full of or inclined to), with 'forget' from Old English 'forgietan' combining 'for-' (away) + 'gietan' (to grasp).
Interestingly, 'forgetful' is much more common than 'forgeful,' but both are valid—'forgeful' appears in older texts and dialects, showing how suffix choices varied historically!
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