amoureux y amoureuse (se)

 "Amoureux" and "amoureuse" are French adjectives that mean "in love" or "loving" when used to describe a person. The main difference between "amoureux" and "amoureuse" lies in their gender forms.

"Amoureux" is the masculine form, used to describe a man who is in love or loving.

"Amoureuse" is the feminine form, used to describe a woman who is in love or loving.

However, "amoureux" and "amoureuse" can also be used as nouns to refer to someone's lover or sweetheart, and in this case, their usage doesn't depend on the gender of the person being referred to.

Regarding "(se) amoureux" and "(se) amoureuse," the addition of "se" in front of the adjective indicates a reflexive construction, meaning "to fall in love" or "to be in love with oneself." 

So, "se amoureux" would be used to express "falling in love with oneself" or "being in love with oneself," and similarly for "se amoureuse."

Examples of how "se amoureux" and "se amoureuse" could be used in French:

Il s'est amoureux de lui-même. (He is in love with himself.)

Elle s'est amoureuse d'elle-même. (She is in love with herself.)

In these examples, the reflexive pronoun "se" indicates that the subject is performing the action on themselves.