Lewis & Short

pompōsus, a, um, adj. [pompa],

  1. I. pompous, stately, solemn (post-class.): incessus, i.e. dignified, slow, Sid. Ep. 4, 9; Ven. Fort. Carm. 3, 23, 7.
  2. II. Rich, Cael. Aur. Acut. 2, 34, 182; id. Tard. 5, 10, 92: poëmata, Ven. Carm. 3, 23, 7.
    Adv.: pompōsē, pompously, etc.: scribere, Sid. Ep. 9, 9 med.