unceasingly

From unceasing +‎ -ly.

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unceasingly (not comparable)

1. Without ceasing (stopping); continuously.
   • 1958 September, C. Alan Cook, “Johannesburg's Fourth Station”, in Railway Magazine, page 641:

     Since that date the work on the new station has gone ahead unceasingly.

   • 1961 July, “Glasgow emergency - the restoration of Clydeside steam suburban services”, in Trains Illustrated, page 432:

     All concerned, more particularly those in charge of the depots, worked unceasingly for long hours.

• ceaselessly, incessantly, nonstop; see also Thesaurus:continuously