The story
- Classical Latin · derived fromratiōnābilis
- Old French · derived fromresnable
- Middle English · inherited fromresonable
- English todayreasonable
From Middle English resonable, from Old French resnable, from Classical Latin ratiōnābilis, from ratiō. By surface analysis, reason + -able. Doublet of rationable.
Words from the same roots
Old Frenchresnable all →
renable
Classical Latinratiōnābilis all →
rationable
Etymology from Wiktionary, CC BY-SA 4.0.