Undersexed refers to a person who has a low or unsatisfactory level of sexual activity or desire. Other synonyms for undersexed include sexually deprived, sexually frustrated, sexually unsatisfied, and sexually inactive. The term may have negative connotations and may suggest that the person is experiencing feelings of loneliness, depression, or inadequacy. It is important to note that not everyone experiences sexual desire or activity at the same level, and that it is completely normal to have fluctuations in libido throughout one's life. If someone is feeling concerned about their level of sexual desire or activity, they may wish to consult a medical professional or therapist.