'Impressiveness' definitions:

Definition of 'impressiveness'

From: WordNet
noun
Splendid or imposing in size or appearance; "the grandness of the architecture"; "impressed by the richness of the flora" [syn: impressiveness, grandness, magnificence, richness]
noun
The quality of making a strong or vivid impression on the mind

Definition of 'Impressiveness'

From: GCIDE
  • Impressive \Im*press"ive\ ([i^]m*pr[e^]s"[i^]v), a. [Cf. F. impressif.]
  • 1. Making, or tending to make, an impression; having power to impress; adapted to excite attention and feeling, to touch the sensibilities, or affect the conscience; as, an impressive discourse; an impressive scene. [1913 Webster]
  • 2. Capable of being impressed. [Obs.] --Drayton. -- {Im*press"ive*ly}, adv. -- {Im*press"ive*ness}, n. [1913 Webster]