In a singing or chanting manner; with a rhythmic, song-like quality to speech or sound.
From 'chant' (from Latin 'cantare,' to sing) plus the adverbial suffix '-ly.' This is a modern formation combining the verb 'chant' with standard adverb-making conventions.
This word is a perfect example of English productivity—we can take almost any verb and add '-ly' to describe how something is done, so even though 'chantingly' is rare, it's instantly understandable to English speakers!
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