The word shiftingly can be described as something that is done in a changing or unsteady manner. Some synonyms for shiftingly include unpredictably, erratically, inconsistently, unsteadily, and unevenly. Unpredictably refers to something that is done without any clear pattern or regularity. Erratically denotes something that is done in a manner that is not uniform or predictable. Inconsistently suggests something that is not done in a steady or reliable manner. Unsteadily is used to describe something that is done with unbalance or lack of support. Lastly, unevenly refers to something that is done with unequal spacing or distribution. All these words can be used interchangeably with shiftingly depending on the context.