The term "precocious" has a few meanings. Generally, when you say someone is precocious, it usually means that that individual is more mentally advanced than his or her peers.
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The precocious toddler had managed to reach the cookie jar on the shelf. The preteen pageants feature girls who are precocious in beauty and talent.
The word precocious can mean "coming ahead" (early) or "smart" (a precocious child is ahead of others, so his development is earlier).Antonyms would therefore be "after" (later, behind) or "unintelligent" (slow).
backward
No, it's not.
Precocious means unusually able at a very young age. We're talking about children who can translate from the Greek at the age of four or play piano concertos at the age of six.