- Of, relating to, or suitable for a child or childhood: a high, childish voice; childish nightmares. (adjective)
- Marked by or indicating a lack of maturity; puerile: tired of your childish pranks. (adjective)
- Not complicated; simple. (adjective)
- Affected mentally by old age; senile. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.