1. 
[syn: vibrant, vivacious]
2.  of sounds that are strong and resonating; 
- Example: "the men's vibrant voices"
3.  of colors that are bright and striking; 
The Collaborative International Dictionary of English v.0.48:
Vibrant \Vi"brant\, a. [L. vibrans, p. pr.: cf. F. vibrant. See
   Vibrate.]
   Vibrating; tremulous; resonant; as, vibrant drums.
   --Longfellow.
   [1913 Webster]
WordNet (r) 3.0 (2006):
vibrant
    adj 1: vigorous and animated; "a vibrant group that challenged
           the system"; "a charming and vivacious hostess"; "a
           vivacious folk dance" [syn: vibrant, vivacious]
    2: of sounds that are strong and resonating; "the men's vibrant
       voices"
    3: of colors that are bright and striking
Moby Thesaurus II by Grady Ward, 1.0:
57 Moby Thesaurus words for "vibrant":
   active, acute, aggressive, animated, brisk, consonant, dynamic,
   energetic, enterprising, enthusiastic, forceful, forcible, full,
   full of pep, go-go, hearty, impetuous, incisive, intense, keen,
   kinetic, lively, living, lusty, mellow, mettlesome, orotund, peppy,
   plangent, pulsing, resonant, resonating, resounding, rich, ringing,
   robust, rolling, rotund, round, smacking, snappy, sonorous,
   spanking, spirited, strenuous, strong, take-charge, take-over,
   throbbing, trenchant, vibrating, vigorous, vivacious, vivid,
   zestful, zesty, zippy