"Un-complaining" refers to being silent about one's suffering or grievances. Antonyms for this word include "complaining," "objecting," "protesting," "grumbling," and "grappling." For instance, someone who is complaining is expressing their dissatisfaction or disapproval openly, while someone who is un-complaining is keeping silent about their concerns. Objecting means to express one's disagreement or opposition, protesting is to publicly demonstrate against something, and grappling refers to trying to overcome a problem or difficulty. Grumbling, on the other hand, involves expressing discontent or annoyance in a low-tone voice. In summary, the antonyms for "un-complaining" encompass a range of expressions of discontent or objections.