piercing UK /ˈpɪəsɪŋ/US /ˈpɪɹsɪŋ/adjective 3noun 2forms 3phrases 1 adjective3 •Appearing to look deeply into; penetrating.piercing eyes •Of sound, loud and sharp; shrill.The piercing noise of the children could be heard two blocks from the elementary school. •Of temperature, extremely cold so that it penetrates through clothing and shelter. noun2 •A hole made in the body so that jewellery can be worn through it. •An item of jewellery designed to be fitted through a piercing. formspiercings · more piercing · most piercing Phrases with piercing ear-piercingExtremely loud (of sound).