Lily-liver is an old-fashioned insult meaning a coward or someone lacking in courage. Synonyms for this word could include terms such as scaredy-cat, chicken, wimp, or yellow-belly. Other possible synonyms might include words like faint-hearted, timid, nervous, or pusillanimous. These terms all suggest a similar lack of bravery or willingness to take risks, indicating a person who tends to shy away from anything too challenging or intimidating. While not always the most flattering terms, sometimes these words can be used playfully among friends as a way to tease someone who's being a bit timid, but they can also be quite cruel if used to bully someone who's genuinely struggling with fear or anxiety.