Granted, the word isn't common, but the first known use of “gruntled” as an adjective to mean “in good humor” or “pleased” (according to the Oxford English Dictionary) is attributed to P.G.

What is the difference between disgruntled and gruntled?

As adjectives the difference between disgruntled and gruntled. is that disgruntled is unhappy; dissatisfied while gruntled is (humorous) satisfied, pleased, contented.

What's a Gruntle?

1. gruntle - cause to be more favorably inclined; gain the good will of; "She managed to mollify the angry customer" appease, assuage, conciliate, gentle, lenify, mollify, pacify, placate.