31 synonyms for secondly such as afterward, additionally, and after that. Secondly is an adverb, and its antonyms are firstly and primarily.
Additionally, After that, Afterward, Another reason, As a second point, As the next item, As the next point, As the second point, By the way (informally), Consequently, Following, Following that, Furthermore, In addition, In sequence, In the next step, In the second place, In turn, Just as importantly, Later, Moreover, Next, On the next point, On the other hand (depending on context), Subsequently, Then, To add, To begin with (in some contexts), To continue, and To proceed.