Antonyms of adj canny

1 sense of canny

Sense 1
cagey, cagy, canny, clever -- (showing self-interest and shrewdness in dealing with others; "a cagey lawyer"; "too clever to be sound")

INDIRECT (VIA smart) -> stupid -- (lacking or marked by lack of intellectual acuity)

Similarity of adj canny

1 sense of canny

Sense 1
cagey, cagy, canny, clever -- (showing self-interest and shrewdness in dealing with others; "a cagey lawyer"; "too clever to be sound")
       => smart (vs. stupid) -- (showing mental alertness and calculation and resourcefulness)