Today’s Parola del Giorno is the adjective, nervoso, which means irritableshort-tempered, and is often used to describe someone who is in a bad mood.  It can also be used to mean nervous, someone who is anxious or tense before a concert or having to speak in public.  It all depends on the context!  See the adjective used below in its context:

Mio padre è sempre nervoso quando torna tardi da lavoro. Certe volte preferisco uscire di casa per non starlo a sentire, perché divento ansioso a stare vicino a lui quando è di cattivo umore.

My father is always irritable when he returns late from work. Sometimes I prefer to get out of the house so that I do not have to listen to him, because I get anxious being near him when he is in a bad mood.