The phrase "gave once-over" is often used to express a quick inspection or glance at something. Antonyms for this phrase would include terms that describe a more prolonged and thorough inspection, such as scrutinized, examined, analyzed, and evaluated. While "gave once-over" implies a cursory examination, these antonyms suggest a more detailed and careful approach to assessing a person or object. Other antonyms could include ignored, overlooked, disregarded, and dismissed, which suggest a lack of attention or concern. Overall, the choice of antonym for "gave once-over" will depend on the level of scrutiny or attention required in a given situation.