Calfish is a relatively uncommon word that refers to someone who is timid, fearful or easily scared. There are several synonyms that can be used instead of 'calfish' to express the same idea, such as: apprehensive, trepid, nervous, fearful, jittery, edgy, anxious, and timid. Each of these words conveys a sense of unease, anxiety or reluctance that characterizes the behavior of someone who is calfish. While it may be tempting to use a more colorful or unusual word like calfish, sticking to simpler, more commonly used synonyms can help ensure that your writing is clear and easily understood by your audience.