Assuasive

If in the Breast tumultuous Joys arise, Musick her soft, assuasive Voice applies; Or when the Soul is press’d with Cares Exalts her in enlivening Airs.

“[…] Perhaps,” said Bounderby, starting with all his might at his so quiet and assuasive father-in-law, “you know where your daughter is at the present time?”

The medicine, whatever it might be, had the merit, rare in doctor’s stuff, of being pleasant to take, assuasive of thirst, and imbued with a hardly perceptible fragrance,

The stuff gagged him but he forced it down. This wasn’t smart but the alcohol had an assuasive effect.

[…] the heat of the sun operates in all its vigour, without an assuasive to mitigate its force.

1817, Richard Yates, The Basis of National Welfare, London: F. C. and J. Rivington et al., § 9, p. 112, the bland, the courteous, the truly Christian assuasives of friendly attention

1908, Mary Virginia Terhune (as Marion Harland), The Housekeeper’s Week, Indianapolis: Bobbs-Merrill, Chapter 23, p. 312, Nature, as the laity may know it, is a vast pharmacopœia of assuasives and curatives