Leftwards is a directional adverb that indicates movement or position towards the left side. If you need to vary your language and avoid repetition, you can use different synonyms for leftwards. For instance, you can use the adverb 'leftward,' which means moving toward the left. Other options you have at hand include 'to the left,' 'on the left side,' 'in a leftward direction,' 'in a leftward movement.' Additionally, you can use other antonyms such as 'rightward,' which refers to moving or pointing in the direction of the right side. Therefore, the synonym of leftwards can be an effective way to add variety to your writing and make your work more engaging.