mollify

(verb) cause to be more favorably inclined; gain the good will of. Synonyms: pacify, lenify, conciliate, assuage, appease, placate, gentle, gruntle. Example: "She managed to mollify the angry customer."

(verb) make more temperate, acceptable, or suitable by adding something else; moderate. Synonyms: temper, season. Example: "She tempered her criticism."

(verb) make less rigid or softer.