This is the 9138th most frequent Polish word.
szczęsny
"Szczęsny" means "happy" or "fortunate" in English.
The word 'szczęsnym' is the instrumental form of 'szczęsny', meaning 'happy' or 'fortunate', describing Jan as a happy individual.
Jan jest szczęsnym człowiekiem.
Jan is a happy man.
The word 'szczęsny' here expresses the speaker's feeling of happiness or contentment about their family.
Czuję się szczęsny, że mam taką rodzinę.
I feel happy that I have such a family.
The term 'szczęsny' is used attributively to describe the day as joyful or fortunate.