UPSET MENTALLY is a term used to describe someone who is emotionally disturbed or distressed. The crossword solutions for this term are DISTURB, which is a verb meaning to cause disruption or distress. This can be done in a variety of ways, such as through physical or verbal aggression, or by creating an environment that is hostile or uncomfortable. It can also refer to the act of upsetting someone's mental state, such as by causing them to become anxious or depressed.