Thoughtless or reckless; acting without careful consideration or discretion.
むやみに他人の秘密をばらしてはいけない。
You shouldn't recklessly divulge other people's secrets.
彼はむやみにリスクを取るタイプではない。
He's not the type to take reckless risks.
むやみな批判はただ人を傷つけるだけだ。
Thoughtless criticism only hurts people.
Excessive or unreasonable; often used adverbially as むやみに or むやみと to mean 'unduly' or 'without restraint'.
むやみに心配しても仕方がない。
It's no use worrying excessively.
むやみに外出するのは控えた方がいい。
You should refrain from going out recklessly.
むやみに人を疑うのは良くない。
It's not good to suspect people without reason.