disgruntle
UK: dɪsˈɡrʌnt(ə)l | US: dɪsˈɡrʌnt(ə)l
vt. to make someone angry or dissatisfied
The word "disgruntle" originated in the late 17th century, derived from the prefix "dis-" (indicating reversal or negation) and the now-archaic verb "gruntle," meaning "to grumble" or "complain." "Gruntle" itself comes from the Middle English "gruntelen," a frequentative form of "grunt," reflecting the sound of discontent. Over time, "disgruntle" evolved to specifically describe causing dissatisfaction, while "gruntle" fell out of common usage. The playful back-formation "gruntled" (meaning satisfied) later emerged humorously in the 20th century.
The delayed flight disgruntled the passengers.
Poor customer service can disgruntle even loyal clients.
He was disgruntled by the unfair decision.
The team became disgruntled after repeated schedule changes.
Her abrupt resignation left the manager visibly disgruntled.