to anyone; to whomever; indiscriminately
Used adverbially to mean 'without distinction of person', often implying openness or lack of selectivity. Common in phrases like 誰彼なしに話しかける (talk to anyone and everyone).
He talks to anyone and everyone.
Don't tell secrets to just anybody.
Standard kanji-kana mixed spelling.
Variant using the kanji 無 for なし.
From 誰彼 (anyone) + なしに (without), literally 'without distinguishing who is who'.