Characterized by or tending to produce cheer and good spirits; having a cheerful quality.
From 'cheerful' plus the suffix '-some' meaning 'characterized by' or 'tending to cause.' The '-some' suffix is ancient (from Old English) and creates adjectives like 'handsome,' 'fearsome,' and 'troublesome.'
The '-some' suffix is fascinating because it often has a special emotional weight—'fearsome' sounds more intense than 'fearful,' and 'cheerfulsome' emphasizes that something actively spreads cheer rather than just being happy itself.
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