Antonyms of adj precocious

2 senses of precocious

Sense 1
precocious (vs. retarded) -- (characterized by or characteristic of exceptionally early development or maturity (especially in mental aptitude); "a precocious child"; "a precocious achievement")

retarded (vs. precocious) -- (relatively slow in mental or emotional or physical development; "providing a secure and sometimes happy life for the retarded")
        => backward, half-witted, slow-witted, feebleminded -- (retarded in intellectual development)
        => imbecile, imbecilic, idiotic -- (having a mental age of three to seven years)
        => moronic -- (having a mental age of between eight and twelve years)
        => cretinous -- (afflicted with cretinism)
        => delayed -- (not as far along as normal in development)
        => dim-witted, simple, simple-minded -- (lacking mental capacity and subtlety)

Sense 2
precocious -- (appearing or developing early; "precocious flowers appear before the leaves as in some species of magnolias")

INDIRECT (VIA early) -> late, later -- (at or toward an end or late period or stage of development; "the late phase of feudalism"; "a later symptom of the disease"; "later medical science could have saved the child")

Similarity of adj precocious

2 senses of precocious

Sense 1
precocious (vs. retarded) -- (characterized by or characteristic of exceptionally early development or maturity (especially in mental aptitude); "a precocious child"; "a precocious achievement")
       => advanced -- (farther along in physical or mental development; "the child's skeletal age was classified as `advanced'"; "children in the advanced classes in elementary school read far above grade average")
          Also See-> intelligent#1

Sense 2
precocious -- (appearing or developing early; "precocious flowers appear before the leaves as in some species of magnolias")
       => early (vs. late) -- (being or occurring at an early stage of development; "in an early stage"; "early forms of life"; "early man"; "an early computer")