A rare or archaic term suggesting something that is suitable, fitting, or conducive to gain or advantage.
Combines 'gain' with the Old English suffix '-some' (meaning 'characterized by' or 'full of'), creating an adjective to describe something with qualities of advantage or suitability. This appears to be a very rare formation.
Gainsome follows the same pattern as words like 'handsome' and 'lonesome,' where '-some' attaches to nouns to create adjectives—but it's so rare that most modern English speakers wouldn't recognize it! It's a window into how productively Old English speakers created new words.
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