This is the 155th most frequent Persian word.
خوبی
Goodness; kindness; virtue.
The word "خوبی" here means "good aspect" or "advantage".
خوبی او این است که همیشه وقتشناس است.
His goodness is that he is always punctual.
The word "خوبی" here is used as part of an expression "با خوبی و خوشی," meaning "with goodness and happiness."
با خوبی و خوشی جشن را برگزار کردیم.
We held the celebration with joy and happiness.
The word "خوبی" here indicates a favorable attribute or benefit of something.