agile alert alive attentive awake bright calm coolheaded inexcitable keen nerveless nimble on the on the alert on the ball on the job prompt qui vive quick ready relaxed rock-steady sharp sleepless smart steady steady-handed steady-nerved steel-nerved strong-nerved unabashed unappalled unawed unblenching uncowed uncringing undaunted undismayed unfaltering unflinching unintimidated unnervous unnodding unquivering unshaken unshaky unshrinking unsleeping unstrained untremulous unwavering unwinking wakeful wide-awake without a tremor