Synonyms of the word

preteen

• adj. Of, relating to, or designed for, or being children between the ages of approximately 10 and 12.
• n. A child in this age group.

immature

• adj. Not fully formed or developed, unripe, not mature.
• adj. Childish in behavior, not mature.
• n. An immature member of a species.

juvenile

• adj. young; not fully developed.
• adj. characteristic of youth or immaturity; childish.
• n. A prepubescent child.
• n. A person not legally of age, or who is younger than may be charged with an offence.
• n. An animal that is not sexually mature.
• n. An actor playing a child's role.
• n. A publication for young adult readers.

preadolescent

• adj. Of or relating to preadolescence.
• n. A child who has not yet reached puberty.

preteenager

• n. A person of less than 13 years of age.

young

• adj. In the early part of growth or life; born not long ago.
• adj. At an early stage of existence or development; having recently come into existence.
• adj. (Not) advanced in age; (far towards or) at a specified stage of existence or age.
• adj. Junior (of two related people with the same name).
• adj. (of a decade of life) Early.
• adj. Youthful; having the look or qualities of a young person.
• adj. Of or belonging to the early part of life.
• adj. (obsolete) Having little experience; inexperienced; unpracticed; ignorant; weak.
• n. People who are young; young people, collectively; youth.
• n. Young or immature offspring (especially of an animal).
• n. (rare, possibly nonstandard) An individual offspring; a single recently born or hatched organism.
• v. (informal or demography) To become or seem to become younger.
• v. (informal or demography) To cause to appear younger.
• v. (geology) To exhibit younging.