What is the word most opposite in meaning to "precarious"?

The word "precarious" refers to a situation that is unstable, uncertain, or dependent on chance, often implying danger or risk. In contrast, "immutable" signifies something that is unchanging, stable, and secure. This stability and lack of susceptibility to change directly oppose the qualities of uncertainty and risk inherent in "precarious." Therefore, "immutable" is indeed the most opposite in meaning, as it conveys a sense of permanence and reliability that is lacking in a precarious condition.

The other choices do not capture this contrast effectively. While "hazardous" relates to danger, it still embodies a sense of risk that parallels "precarious." "Scraggly" reflects a disheveled appearance, which does not address the concept of stability or insecurity. "Common," on the other hand, refers to the state of being widespread or ordinary, which has little relevance to the characteristics defining "precarious."