The word "wast first" does not exist in the English language. Therefore, antonyms for this nonexistent word cannot be provided. However, if we assume that the intended word is "was first," some possible antonyms could include "was last," "was second," "was second-to-last," or any other position in a sequence that is not the first. Antonyms for "first" alone could include "last," "final," "end," and "conclusion," among others. Antonyms are important in language to convey opposite meanings and provide context for understanding words and ideas.