不知天高地厚

Explanation: Do not understand the complexity of things, describe the arrogance of ignorance 　　Usage: Verb-object type; as the predicate attribute; describe the arrogance of ignorance 　　Source: Qing Wen Kang "Heroic Biography" 34 back: "If this had not known, I think of childhood the words of those bragging, really feel apologetic." 　　Examples: If this had not known, I think of them ~ the words of young, really feel sorry. ★ Qing Wen Kang "Children Heroes" back to the thirty-fourth Thesaurus:  Act recklessly, guiltless interest, not knowing whether to advance or retreat, abrupt, guiltless deep, guiltless accident, Primary calf, Do not know the level of, be very promising Antonym Group:  Reasonable notice, Reasonable notice of