'Piercingly' definitions:

Definition of 'piercingly'

From: WordNet
adverb
Extremely and sharply; "it was bitterly cold"; "bitter cold" [syn: piercingly, bitterly, bitingly, bitter]
adverb
In a shrill voice; "she sang rather shrilly" [syn: shrilly, piercingly]

Definition of 'Piercingly'

From: GCIDE
  • Piercing \Pier"cing\, a. Forcibly entering, or adapted to enter, at or by a point; perforating; penetrating; keen; -- used also figuratively; as, a piercing instrument, or thrust. "Piercing eloquence." --Shak. [1913 Webster] -- {Pier"cing*ly}, adv. -- {Pier"cing*ness}, n. [1913 Webster]