Troublable is a word that is rarely used and isn't common in everyday language. Due to its infrequent use, there aren't many antonyms for the word. However, if we look at the context that the word is used in, we can derive some possible antonyms. For instance, if we look at the definition of 'troublable' as being easily disturbed or agitated, we could derive the antonyms as tranquil, peaceful or calm, meaning not easily disturbed, peaceful, and relaxed. Other possible antonyms could include composed, serene, equable, or unperturbed, implying a state of calmness and stability with minimal disturbance. Ultimately, context is key when determining antonyms for uncommon words like 'troublable'.