1Feeling warm, fond nostalgia for something from the past — a person, place, or memory one hasn't experienced in a long time; often said upon reuniting with or rediscovering something old.
卒業アルバムを見ていたら、学生時代が懐かしくなった。
Looking through my graduation album made me feel nostalgic for my school days.
久しぶりに実家に帰ると、懐かしい匂いがした。
When I went back to my parents' house after a long time, it smelled nostalgic.
「懐かしい！この曲、高校のとき毎日聴いてた。」
"How nostalgic! I used to listen to this song every day in high school."
町で昔の同僚に会って、懐かしい話に花が咲いた。
I ran into an old coworker in town, and we had a lively, nostalgic chat.