Complacent – Smug and self-satisfied
The complaint was sent (complacent) but it was ignored in a smug and self-satisfied way.
Examples of complacent in a sentence
He was complacent about his ability to swim across the fast-flowing river and drowned in the attempt.
The runner was so complacent about a victory that she placed a £1,000 bet on herself to win the race.
She had delivered so many business successes over the years that she became complacent and that is when her business started to fail.