Green’s Dictionary of Slang

(US) trivial, not worthy of consideration, easy.

1989		A. Sorkin A Few Good Men (1990) 96: You’re a lousy, fuckin’ softball player, Jack.
2003		R. Lowry interviewed by Kathryn Jean Lopez in NationalReviewOnline 16 Oct. 🌐 Come on Kathryn, I thought this was going to be a softball interview.
2022		A. Kirzman Giuliani 351: She asked Giuliani two softball questions about Covid .