audacious
bold
calm
coolheaded
courageous
dauntless
fearless
inexcitable
intrepid
nerveless
relaxed
rock-steady
steady
steady-handed
steady-nerved
steel-nerved
strong-nerved
unabashed
unappalled
unawed
unblinking
uncowed
uncringing
undaunted
undismayed
unfaltering
unflinching
unintimidated
unnervous
unquivering
unshaken
unshaky
unshrinking
unstrained
untremulous
unwavering
valiant
valorous
without a tremor