jittery Antonyms

sedate unruffled unshakable valiant valorous venturesome venturous unshaken undisturbed daredevil unconcerned tranquil self-assured self-confident self-contained self-possessed serene steady stolid therewith together unafraid at peace unexcitable unfazed untroubled unflappable self-controlled unbothered unperturbed well-adjusted well-balanced even-tempered at ease unfearing laid-back easygoing lionhearted carefree happy-go-lucky unworried coolheaded imperturbable as cool as a cucumber secure adventuresome collected composed confident cool