1. 
[syn: collected, equanimous, poised, self-collected, self-contained, self-possessed]
The Collaborative International Dictionary of English v.0.48:
Equanimous \E*quan"i*mous\, a. [L. aequanimus, fr. aequus equal
   + animus mind.]
   Of an even, composed frame of mind; of a steady temper; not
   easily elated or depressed. --Bp. Gauden.
   [1913 Webster]
WordNet (r) 3.0 (2006):
equanimous
    adj 1: in full control of your faculties; "the witness remained
           collected throughout the cross-examination"; "perfectly
           poised and sure of himself"; "more self-contained and
           more dependable than many of the early frontiersmen";
           "strong and self-possessed in the face of trouble" [syn:
           collected, equanimous, poised, self-collected,
           self-contained, self-possessed]