In a way that never stops or pauses; continuously and without interruption.
From 'cease' (to stop, from Latin 'cessare') plus '-less' (without) plus '-ly' (adverb marker), literally meaning 'without stopping, in a stopping-less manner.'
This word is built from three ancient pieces—Latin 'cessare,' Old English 'less,' and Latin 'ly'—showing how English creates new words by stacking historical layers on each other.
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