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Use "favourableness" in a sentence
"It is by the favourableness or otherwise (of time and place) that the opportuneness of an act is determined."
"I mean the consideration of the favourableness of the present times to all exertions in the cause of liberty."
"I was quite uneasy at getting no attack from the "Witness," thinking I must have overestimated the impression that I had made, and the favourableness of the reception of what I said."