The antonym for "un-blinking" is "blinking." This refers to the action of closing and opening one's eyes rapidly, often as a reflexive response to stimuli or emotion. Additionally, the term "blinking" can be used to describe something that is rapid or intermittent, such as a flickering light. Other potential antonyms for "un-blinking" might include phrasing such as "averting one's gaze," "looking away," or "showing hesitation or uncertainty." These terms can imply a lack of steady focus or an unwillingness to maintain eye contact, as opposed to the steely resolve often associated with an unblinking gaze.