without compunction; coolly; nonchalantly; without hesitation
Describes doing something that might normally cause guilt, hesitation, or emotional reaction, but doing it calmly, shamelessly, or without batting an eye. Often used for actions that are surprising, bold, or morally questionable.
He tells lies without compunction.
She speaks ill of others without batting an eyelid.
That kid climbs dangerous places without hesitation.
Adverbial form of 平気 (へいき), which is composed of 平 (へい, 'flat, calm') and 気 (き, 'spirit, mind'). The word 平気 itself is a Sino-Japanese compound.