Stationariness refers to the state of being unmoving or fixed. There are several synonyms for stationariness, including immobility, stillness, stability, quiescence, and steadfastness. Immobility refers to the inability to move, while stillness implies the absence of movement or sound. Stability refers to the ability to remain constant or steady, while quiescence indicates a state of rest or inactivity. Steadfastness suggests a resoluteness or unwavering commitment to a particular course of action. All these synonyms for stationariness describe a state of being that is reliable, unchanging, and steadfast, and they can be used interchangeably depending on the context of the sentence.