[Idiom] Become insensitive, rough

[SevPuch]

Hello, I've been looking for an idiom for when someone becomes cold in general, closes up his heart, becomes insensitive.
Additionaly is there one involving a tree bark, or a rock?
It's better if I can avoid the word heart.

Thanks a lot
Sev

 

[emsr2d2]

Hello.

I've been looking for an idiom for when someone becomes cold in general, closes up [STRIKE]his[/STRIKE] their heart, and/or becomes insensitive. Additionally, is there one involving [STRIKE]a[/STRIKE] tree bark no comma here or a rock? [STRIKE]It's[/STRIKE] It would be better if I can avoid the word "heart".

[STRIKE]Thanks a lot.[/STRIKE] Unnecessary. Thank us after we help you, by clicking on the "Thank" button.
[STRIKE]Sev[/STRIKE] Unnecessary. We can see your username on all your posts.

Please note my corrections and comments above.

Why are you looking for this idiom and why do you need to avoid the word "heart"?

 

[probus]

Tom Waits, who has been known to bill himself as a poet, has a wonderful idiom in one of his songs. He describes a cold person who just doesn't care what others say or think as "independent as a hog on ice." It makes me smile every time I hear it.

 

[Charlie Bernstein]

Hello, I've been looking for an expression for when people become cold in general, close up their heart, become insensitive.
Additionaly is there one involving a tree bark[STRIKE],[/STRIKE] or a rock?
It's better if I can avoid the word heart.

Thanks a lot.
Sev

Use gender-neutral language. The singular they and their sometimes work, but whenever reasonably possible, use singluar nouns with singular verbs and plural nouns with plural verbs.

There are expressions for cold-heartedness, but I can't think of an expression for becoming cold-hearted.

By the way, look up idiom and expression to see the difference.