1. A day marked by poor weather conditions, unpleasant events, or a generally negative mood or atmosphere
Yesterday was an ugly day; it rained all morning and I had several problems at work.
Ontem foi um dia feio; choveu a manhã toda e tive vários problemas no trabalho.
2. A day when someone feels unwell, sad, or emotionally distressed
She's having an ugly day because her best friend moved away.
Ela está tendo um dia feio porque sua melhor amiga se mudou.