The phrase "no catch" is often used to assure that there are no hidden or deceitful motives behind an offer or agreement. Some antonyms for "no catch" could be "trickery," "deception," "hidden agenda," "fine print," "strings attached," "trap," or "sham." These words suggest that there may be a hidden cost or catch that is not immediately apparent. When making an agreement, it's important to read the fine print and fully understand the terms to avoid any negative consequences that may arise from a hidden catch. Using language that clearly states that there are no strings attached can increase trust and confidence in the agreement or offer.