The term "gives onceover" means to briefly examine or check something. Antonyms for this term could include phrases like "ignores thoroughly," "neglects to inspect," or "misses completely." These antonyms imply a lack of attention or care towards the object being examined, indicating a disregard or indifference for its importance. Additionally, antonyms for "gives onceover" could include more exacting phrases like "scrutinizes in detail," "analyzes closely," or "inspects carefully," indicating a more careful, critical assessment of the subject at hand. In many cases, the choice of antonym for "gives onceover" will depend on the specific context and the degree of scrutiny that is required.