迂闊
I-adj
1
adjectival nouns or quasi-adjectives (keiyodoshi)
word usually written using kana alone
careless;thoughtless;stupid;heedless;unobservant;inadvertent;incautious
そんな事をするとはうかつだった。
It was careless of me to do something like that.
Other forms
迂濶 【うかつ】 (rarely used kanji form)