GRUNTLE
pacify, lenify, conciliate, assuage, appease, mollify, placate, gentle, gruntle
(verb) cause to be more favorably inclined; gain the good will of; “She managed to mollify the angry customer”
Source: WordNet® 3.1
Etymology 1
Verb
gruntle (third-person singular simple present gruntles, present participle gruntling, simple past and past participle gruntled)
(obsolete) To utter small, low grunts.
(obsolete) To complain; to grumble
Etymology 2
Noun
gruntle (plural gruntles)
A grunting sound.
A snort.
Etymology 3
Verb
gruntle (third-person singular simple present gruntles, present participle gruntling, simple past and past participle gruntled)
(humorous) To humour; to induce the opposite effect of causing a person to become disgruntled.
Synonyms: humour, regruntle (humorous)
Usage notes
To gruntle is not in normal usage. It has gained a certain currency amongst information security specialists to describe a process whereby the negative feelings of a disgruntled user might be reduced, or positive feelings induced.
Source: Wiktionary
Grun"tle, v. i. Etym: [Freq. of grunt.]
Definition: To grunt; to grunt repeatedly. [Obs.]
Source: Webster’s Unabridged Dictionary 1913 Edition