Gruntled is a back-formation from the word disgruntled. Originally gruntle was an old word that meant to grumble, however in the 1920’s gruntle(d) was used in a humorous manner to mean “make happy” and thus, a new definition and usage was born! If one is gruntled they are pleased or satisfied as opposed to feeling sulky or dissatisfied, you know disgruntled.
Gruntled may still be used in a mostly humorous way but I suppose it makes sense since it’s a rather fun and amusing word!
Namaste ~ Ella
** If there’s a word you’d like to see added to the Word Nerd roster, please feel free to contact me or suggest it in the comments – I love feedback and recommendations!