Antonyms of adj up_on

1 sense of up on

Sense 1
abreast (predicate), au courant, au fait, up on (predicate) -- (being up to particular standard or level especially in being up to date in knowledge; "kept abreast of the latest developments"; "constant revision keeps the book au courant"; "always au fait on the latest events"; "up on the news")

INDIRECT (VIA informed) -> uninformed -- (not informed; lacking in knowledge or information; "the uninformed public")

Similarity of adj up_on

1 sense of up on

Sense 1
abreast (predicate), au courant, au fait, up on (predicate) -- (being up to particular standard or level especially in being up to date in knowledge; "kept abreast of the latest developments"; "constant revision keeps the book au courant"; "always au fait on the latest events"; "up on the news")
       => informed (vs. uninformed) -- (having much knowledge or education; "an informed public"; "informed opinion"; "the informed customer")