complacently
🇺🇸
/kəmˈpleɪsntli/
🇬🇧
/kəmˈpleɪsntli/
Feeling self-satisfied and not wanting to change anything
He complacently sat back in his chair, believing everything was going perfectly.
彼は全てが完璧に進んでいると信じて、満足げに椅子に座っていました。