Lacking happiness or unfortunate, formed by adding a suffix to 'happy,' though this word is quite archaic and rarely used.
From 'happy' + '-less' (a suffix meaning 'without' or 'lacking'), though the more common modern form is 'unhappy.' The '-less' suffix was productive in Middle and Early Modern English for creating negative adjectives.
Words like 'happiless' show us that English speakers once had different options for expressing negation—they could say 'happiless,' 'unhappy,' or 'not happy'—but over centuries, 'unhappy' won out, and now 'happiless' sounds quaint and poetic rather than normal.
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