childish

• Don't be childish--don't refuse. —  Ten Tales
• But her father, a man of great wealth and ambition, did not approve of what he chose to call her childish fancy, and, being desirous that his daughters should form brilliant marriages, frowned scornfully on the suit of one who had only his irreproachable character and his commission in the army of the United States to offer as his credentials. —  'Three Score Years and Ten' Life-Long Memories of Fort Snelling, Minnesota, and Other Parts of the West
• I recalled my childish ambition to keep a fried fish shop and despised it heartily. —  The Belovéd Vagabond
• How childish is the thirst for such trivial fame as that a poet gains! —  Béarn and the Pyrenees A Legendary Tour to the Country of Henri Quatre
• He had provided himself with this drug, and as he studied its appearance in the phial, so minute, so colorless, so helpless in its prison, he felt once again the mystery of matter, and smiled to think how childish was the popular conception of the physical universe as something dead and inorganic. —  The Tyranny of the Dark

Roget's II: The New Thesaurus

Allen's Synonyms and Antonyms

Used in the Same Context