In Spanish, the word for ‘bad’ is ‘malo’ when referring to something masculine and ‘mala’ when referring to something feminine. For example, you would say ‘un día malo’ (a bad day) and ‘una película mala’ (a bad movie). The word ‘mal’ can also be used as an adverb to mean ‘badly’ or ‘poorly.’ For instance, ‘Ella canta mal’ means ‘She sings badly.’ Understanding these nuances helps in using the correct form based on the context and the gender of the noun being described.