Antonyms of adj all-knowing

1 sense of all-knowing

Sense 1
all-knowing, omniscient -- (infinitely wise)

INDIRECT (VIA wise) -> foolish -- (devoid of good sense or judgment; "foolish remarks"; "a foolish decision")

Similarity of adj all-knowing

1 sense of all-knowing

Sense 1
all-knowing, omniscient -- (infinitely wise)
       => wise (vs. foolish) -- (having or prompted by wisdom or discernment; "a wise leader"; "a wise and perceptive comment")