
The first known use of adjective gruntled was about 100 years ago. It was a writer who decided to playfully remove the dis- from disgruntled and create its antonym to mean “to make happy”, In the Merriam-Webster dictionary, it is listed as a word to use informally, so perhaps avoid using it in professional settings.
Example:
I was gruntled to see a small kitten on my doorstep. I had to take her in and adopt her.
Disgruntled is a word that goes as far back as the 1600s, so this word came first. A word that is in common use, it’s an adjective that means angry or dissatisfied.
Example:
I was disgruntled to learn that decisions were being made with consulting me.
Let's rally the troops and bring back gruntled into common use!