比赛很圆满怎么说英语

If a competition or event was very successful or satisfying, you could say that it was "smooth sailing" or "a resounding success". You could also say that it was "a complete success" or "a great success". Here are a few more phrases you could use to describe a successful event:
"It went off without a hitch"
"It was a triumph"
"It was a resounding victory"
"It was a smashing success"
For example, you could say: "The competition was a complete success. Everything went smoothly and everyone had a great time."