In full control of your faculties:
— Strong and self-possessed in the face of trouble.

synonyms: collected, equanimous, poised, self-collected, self-contained.

Roget 864: cautious, wary, guarded; on one's guard etc. (watchful) 459; cavendo tutus [Lat.]; in medio tutissimus [Lat.]; vigilant.    careful, heedful; cautelous^†, stealthy, chary, shy of, circumspect, prudent, discreet, politic; sure-footed etc. (skillful) 698.    unenterprising, unadventurous, cool, steady, self-possessed; overcautious.    ... show more

Roget 502: sane, rational, reasonable, compos mentis, of sound mind; sound, sound-minded; lucid.    self-possessed; sober, sober-minded.    in one's sober senses, in one's right mind; in possession of one's faculties.    ... show more

Roget 604: resolved etc. v.; determined; strong-willed, strong-minded; resolute etc. (brave) 861; self-possessed; decided, definitive, peremptory, tranchant^†; unhesitating, unflinching, unshrinking^†; firm, iron, gritty [U.S.], indomitable, game to the backbone; inexorable, relentless, not to be shaken, not to be put down; tenax propositi [Lat.]; inflexible etc. (hard) 323; obstinate etc. 606; steady etc. (persevering) 604.1. earnest, serious; set upon, bent upon, intent upon.    steel against, proof against; in utrumque paratus [Lat.].    ... show more