The story
- Old English · inherited fromġearnfull
- Middle English · inherited fromyernful
- English todayyearnful
From Middle English yernful, ȝeornful, from Old English ġearnfull, ġeornful (“desirous, eager, zealous, diligent, anxious”), equivalent to yearn + -ful.
Etymology from Wiktionary, CC BY-SA 4.0.