There are many synonyms for the phrase "as timid as a rabbit" that can be used to describe someone or something that is timid or easily frightened. Some of the most common include "as meek as a mouse," "as shy as a deer," "as timid as a fawn," "as skittish as a colt," and "as nervous as a cat." Other possible synonyms include "as apprehensive as a bird," "as cautious as a squirrel," "as bashful as a lamb," and "as hesitant as a hare." Each of these phrases can be used to describe someone who is shy, quiet, and easily intimidated, or something that is easily scared or spooked.