The word "unfixedly" describes something that is not firmly or permanently in place. To find antonyms for this word, we need to look for words that suggest stability, fixity or permanency. Some possible antonyms for "unfixedly" include words like immovably, steadfastly, securely, firmly, motionlessly, rigidly, permanently, immutably, unchangeably, and fixedly. These words all convey a sense of something that is firmly established and not easily moved or shifted. Using these antonyms, we can describe a wide range of situations where things are precisely and permanently in place, whether they're buildings, relationships, or personal beliefs.