The term 'bright-eyed' is often used to describe someone who appears alert, awake and attentive. However, if one wants to convey an opposite meaning, they may use terms like 'dull-eyed', 'heavy-lidded', 'sleepy-eyed' or 'drowsy-eyed'. These words imply a lack of energy or alertness and suggest a feeling of lethargy or disinterest. Other antonyms to describe someone who is not bright-eyed could be 'exhausted-looking', 'fatigued', 'bleary-eyed', 'weary' or 'listless'. These words can help to indicate that one is feeling tired or unwell rather than being focused and enthusiastic. It's important to use antonyms correctly to convey the intended meaning in writing or speech.