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The Collaborative International Dictionary
Tranquillizingly

Tranquilizing \Tran"quil*i`zing\, Tranquillizing \Tran"quil*li`zing\, a. Making tranquil; calming. `` The tranquilizing power of time.''
--Wordsworth. -- Tran"quil*i`zing*ly or Tran"quil*li`zing*ly, adv.

Wiktionary
tranquillizingly

adv. So as to tranquillize; calmingly. alt. So as to tranquillize; calmingly.