1. A day that is so memorable or significant that it cannot be forgotten; a day that leaves a lasting impression
Our wedding day was truly an unforgettable day.
Nosso dia de casamento foi realmente um dia inesquecível.
2. A day marked by extraordinary events, emotions, or experiences that remain vivid in memory
The day I graduated was an unforgettable day for me and my family.
O dia da minha formatura foi um dia inesquecível para mim e minha família.