心こころ置おきなく

こ

ろ

お

き

な

く

Meanings

1

Used when doing something openly, without hesitation or holding back, often in social or emotional contexts.

話はな

し

て

ください

。

Please feel free to talk about anything.

彼かれは心こころ置おきなく自じ分ぶんの意い見けんを述のべた。

He frankly stated his opinion.

遠えん慮りょなく
心置きなく and 遠慮なく both mean 'without reservation,' but 心置きなく is slightly more literary and often used for enjoying something fully, while 遠慮なく is common in everyday offers and invitations.
思おもう存ぞん分ぶんN1
心置きなく emphasizes doing something 'without reservation or hesitation', whereas 思う存分 emphasizes doing it 'to the fullest extent'.

From 心置き (reservation, worry) + なく (adverbial form of ない, 'without'). Literally 'without anything left on one's mind'.