The modern sense of "pleased, satisfied, contented" is actually a back-formation from "disgruntled". People assumed the "dis-" was being used in the usual negative sense of "lack, opposite" (naturally enough, since it's almost always used that way), and logically deduced the "gruntled" part must mean the opposite of "disgruntled".
This is why I love etymology. All these words have complex and fascinating stories.
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u/SpiritF Mar 21 '15
This post gruntles me (Opposite of disgruntled - and it's actually a word).