The term "lidless eye" refers to an intense gaze, usually associated with suspicion or scrutiny. Synonyms for "lidless eye" include piercing or penetrating gaze, watchful eye, keen eye, and eagle eye. Each of these synonyms highlights the intensity and focus of the gaze, as if the person is using their eyes as a tool to gather information. Other words that could be synonymous with "lidless eye" include unblinking stare, unyielding gaze, and unwavering eye. Although these words have slightly different connotations and implications, they all convey a sense of watchfulness and intensity that can be felt even without being explicitly stated.