Fetching details from the dictionary...

thoughtlessly; recklessly; rashly; indiscriminately; indiscreetly; at random
excessively; unreasonably; immoderately; absurdly
無暗に処方薬を飲むのは体に良くないと医者が言った。
The doctor said taking prescription medicine indiscriminately is bad for your health.
無暗に知らない人の話を信じるべきではないだろう。
You probably should not rashly believe what strangers say.
彼は無暗に高価なものを買う癖がある。
He has a habit of recklessly buying expensive things.