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Adjective: flustered  flús-tu(r)d
  1. Thrown into a state of agitated confusion; ('rattled' is an informal term)
    "The more he loses, the more flustered he gets";
    - hot and bothered, perturbed, rattled
Verb: fluster  flús-tu(r)
  1. Be flustered; behave in a confused manner
  2. Cause to be nervous or upset

See also: discomposed

Type of: acquit, bear, behave, carry, comport, conduct, confuse, deport, disconcert, flurry, put off