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pierc‧ing1

1 someone with piercing eyes is looking at you and seems to know what you are thinking :
There was mockery now in those piercing blue eyes.
eyes/look
literary
There was mockery now in those piercing blue eyes.2 a sound that is piercing is high, sharp, and unpleasant :
He grinned and let out a piercing whistle.
a piercing scream
sound
He grinned and let out a piercing whistle.
a piercing scream3 a piercing wind is very cold
wind
4 causing a lot of pain :
She felt a piercing sensation in her arm.
pain
She felt a piercing sensation in her arm.5 affecting your feelings very deeply in a sad way :
a piercing moment of regret
emotion
[only before noun]
a piercing moment of regret —piercingly adverb:
It was piercingly cold.
She looked at him piercingly.
It was piercingly cold.
She looked at him piercingly.