SMUG

[adjective] smugger, smuggest - very pleased or satisfied in an annoying way about something you have achieved or something you knowShe did very well to get the job, but I wish she wasn't so damned smug about it.I reckon she has good reason to feel smug.There was a hint of smug self-satisfaction in her voice as she explained why her investments had been so successful.He's been unbearably smug since he gave up smoking.It's difficult to tell people about exam results that are as good as mine without sounding smug.