This is the 34th most frequent Hungarian word.
jó
"Good"
The word 'jó' is used as an adjective to describe the quality of the noun 'könyv' (book).
Ez a könyv nagyon jó.
This book is very good.
The word 'jó' is an adjective modifying the noun 'filmet' (movie), indicating its positive quality.
Ma egy jó filmet néztem meg.
Today I watched a good movie.
The word 'jó' is used as part of the greeting expression 'Jó reggelt' (Good morning), functioning as an adjective referring to the morning (reggelt).