They compete against each other in the swimming competition.

She is very competitive and always wants to win.

She is a tough competitor in the business world.

Eating a balanced diet is the complement of a healthy lifestyle.

I have completed all of my tasks.

The answer is completely wrong.

The human brain is a complex organ.

Your refusal to help complicated matters.

The instructions for assembling the furniture were so complicated that I had to ask for help.

Your compliment really made my day.