The term "smart talk" refers to clever, intelligent, or sophisticated language. Its antonyms include dull, unintelligent, and plain-spoken. The opposite of smart talk would be simple language that is not difficult to understand, lacks complexity or intellectual depth. Dull conversation may be devoid of wit or cleverness, making it uninteresting or uninspiring. It might not engage the listener or stimulate their imagination, understanding or curiosity. Unlike smart talk, plain-spoken speech conveys its meaning clearly without any intricate or sophisticated language. Overall, the antonyms of "smart talk" suggest a communication style that is uncomplicated and straightforward, with little regard for subtle nuances, wit or intellectual challenges.