Dark, gloomy, or lacking light; an archaic or poetic form meaning dark and somewhat ominous.
From 'dark' with the archaic suffix '-some' (meaning 'characterized by' or 'full of'), similar to words like 'fearsome' and 'tiresome'. Common in medieval and Renaissance literature.
This suffix '-some' is mostly frozen in old words now—we don't make new ones with it much anymore, so 'darksome' sounds authentically ancient when you encounter it in old poems.
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