The antonyms for the phrase "letting easy" are many, and they vary based on context. In general, the opposite would be making things difficult or challenging. Some possible antonyms include complicating, obstructing, hindering, frustrating, opposing, resisting, and blocking. For example, if you are trying to make a difficult decision, you might want to avoid "letting things easy" and instead embrace the challenge by weighing all the options and considering the consequences. Similarly, if you are attempting to complete a complex project, you may need to actively work against "letting it easy" by staying focused and putting in the necessary effort to ensure success.