The word "psychasthenic" describes a person who is prone to anxiety, nervousness, and other similar mental issues. There are several synonyms for this word that can be used to describe such individuals. These include "neurotic," "anxious," "worried," "tense," "agitated," "apprehensive," and "unsettled." Similarly, other related terms that can be used include "fearful," "panicky," "jittery," "overwrought," "stressed," and "edgy." Using synonyms can help to diversify language use and make communication more effective. It also enables one to avoid repetition and provide additional context and meaning to their words.