of a current Reversing direction.

Roget 149: changeable, changeful; changing etc. 140; mutable, variable, checkered, ever changing; protean, proteiform^†; versatile.    unstaid^†, inconstant; unsteady, unstable, unfixed, unsettled; fluctuating etc. v.; restless; agitated etc. 315; erratic, fickle; irresolute etc. 605; capricious etc. 608; touch and go; inconsonant, fitful, spasmodic; vibratory; vagrant, wayward; desultory; afloat; alternating; alterable, plastic, mobile; transient etc. 111; wavering.    ... show more

Occurring by turns; first one and then the other:
— Alternating feelings of love and hate.

synonym: alternate.

Polish: naprzemienny, przemienny