The Collaborative International Dictionary of English v.0.48:

deflated \deflated\ adj.
   1. brought low in spirit. left us fatigued and deflated
      spiritually

   Syn: chapfallen, chopfallen, crestfallen.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

deflated
    adj 1: brought low in spirit; "left us fatigued and deflated
           spiritually" [syn: chapfallen, chopfallen,
           crestfallen, deflated]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "deflated":
   abated, ablated, attenuated, bated, belied, belittled, confounded,
   confuted, consumed, contracted, curtailed, decreased, denied,
   diminished, discarded, discredited, dismissed, disproved, disputed,
   dissipated, dropped, eroded, exploded, exposed, fallen, flat,
   impugned, invalidated, less, lesser, lower, lowered, miniaturized,
   negated, negatived, overthrown, overturned, punctured, reduced,
   refuted, rejected, retrenched, scaled-down, shorn, shorter,
   shown up, shrunk, shrunken, smaller, upset, watered-down, weakened,
   worn