"Lidless eyes" is a term that can be used to describe someone or something that has a haunting and unsettling appearance. There are many synonyms that can be used instead of "lidless eyes" to convey this same sense of unease. Some possible synonyms include "unblinking gaze," "empty stare," "piercing eyes," "soulless eyes," "cold eyes," "hollow eyes," "lifeless eyes," "glassy eyes," and "deathly stare." All of these terms have their own unique connotations and can be used to create different moods and feelings in a piece of writing or conversation. Choosing the right synonym depends on the context and tone of the discussion.