Antonyms of adj shrewd

2 senses of shrewd

Sense 1
astute, sharp, shrewd -- (marked by practical hardheaded intelligence; "a smart businessman"; "an astute tenant always reads the small print in a lease"; "he was too shrewd to go along with them on a road that could lead only to their overthrow")

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

Sense 2
calculating, calculative, conniving, scheming, shrewd -- (used of persons; "the most calculating and selfish men in the community")

INDIRECT (VIA hard) -> soft -- (compassionate and kind; conciliatory; "he was soft on his children")

Similarity of adj shrewd

2 senses of shrewd

Sense 1
astute, sharp, shrewd -- (marked by practical hardheaded intelligence; "a smart businessman"; "an astute tenant always reads the small print in a lease"; "he was too shrewd to go along with them on a road that could lead only to their overthrow")
       => smart (vs. stupid) -- (showing mental alertness and calculation and resourcefulness)

Sense 2
calculating, calculative, conniving, scheming, shrewd -- (used of persons; "the most calculating and selfish men in the community")
       => hard (vs. soft) -- (dispassionate; "took a hard look"; "a hard bargainer";)