" unshaken "

1: free from emotional or mental agitation;

  * e.g., " ... the hostage remained unshaken throughout the ordeal "

•  Synonyms : 

•  calm,

•  collected,

•  composed,

•  cool,

•  coolheaded,

•  equal,

•  level,

•  limpid,

•  peaceful,

•  placid,

•  possessed,

•  recollected,

•  sedate,

•  self-composed,

•  self-possessed,

•  serene,

•  smooth,

•  together,

•  tranquil,

•  undisturbed,

•  unperturbed,

•  unruffled,

•  untroubled,

•  unworried

•  Antonyms : 

•  agitated,

•  discomposed,

•  disturbed,

•  flustered,

•  perturbed,

•  unglued,

•  unhinged,

•  unstrung,

•  upset