keep one shirt on (verb) keep one's cool: remain calm
Sinonime: afraid,
anxious,
apprehensive, backward,
base, caitiff, chicken-hearted, cowering, cowhearted, craven, dastardly,
diffident, dismayed, fainthearted,
frightened, gutless, having the willies, jittery, lacking courage, lily-livered,
nervous, no guts, panicky, paper tiger, pigeonhearted,
pusillanimous, recreant, retiring, running scared,
scared, shrinking,
shy,
soft*, spineless, timid, timorous,
weak, weak-kneed,
worthless,
yellow*, yellow-bellied
Antonime: bold,
brave,
courageous,
daring,
dauntless, unafraid,
undaunted, unfearful