fortissimo

from WordNet (r) 3.0 (2006)

fortissimo
    adv 1: a direction in music; to be played very loudly [syn:
           {fortissimo}, {very loudly}] [ant: {pianissimo}, {very
           softly}]
    adj 1: chiefly a direction or description in music
    n 1: (music) loud [syn: {forte}, {fortissimo}]

from The Collaborative International Dictionary of English v.0.48

Fortissimo \For*tis"si*mo\ (? or ?), adv. [It., superl. of
   forte, adv. See {Forte}, adv.] (Mus.)
   Very loud; with the utmost strength or loudness.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

87 Moby Thesaurus words for "fortissimo":
      a cappella, abbandono, accrescendo, adagietto, adagio, affettuoso,
      agilmente, agitato, allegretto, allegro, aloud, amabile, amoroso,
      andante, andantino, appassionatamente, appassionato, booming,
      brillante, capriccioso, con affetto, con agilita, con agitazione,
      con amore, crescendo, deafening, decrescendo, diminuendo, dolce,
      ear-piercing, ear-rending, ear-splitting, earthshaking, forte,
      fortemente, full, in full cry, lamentabile, larghetto, larghissimo,
      largo, legato, leggiero, loud, loud-sounding, loudish, loudly,
      lustily, marcando, morendo, noisily, parlando, pealing, pianissimo,
      piano, piercing, pizzicato, plangent, prestissimo, presto,
      rallentando, resounding, resoundingly, ringing, ringingly,
      ritardando, ritenuto, scherzando, scherzo, scherzoso, sonorous,
      sordo, sotto voce, spiccato, staccato, stentoraphonic, stentorian,
      stentorious, stretto, thunderous, tonitruant, tonitruous,
      tremolando, tremoloso, trillando, uproariously, window-rattling