harden »
To become or make a thing resistant or less sensitive.
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hear the grass grow »
To have an extremely sensitive sense of hearing.
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keep mum »
Do not talk; especially keep silent about something that may be sensitive or secret.
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keep shtum »
Don't tell anyone; especially, keep silent about something that may be sensitive or secret.
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pachyderm »
Someone who is insensitive.
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thin-skinned »
Overly sensitive to criticism; quick to take offence; touchy.
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touch-and-go »
Precarious, delicate, dangerous, risky, sensitive or of uncertain outcome.
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walk on eggshells »
To be careful and sensitive, in handling very sensitive matters.
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