on tenterhooks Antonyms

imperturbable stolid steady serene self-possessed self-contained self-assured sedate reposeful relieved together tranquil coolheaded happy-go-lucky easygoing laid-back unagitated undisturbed unshaken unshakable unruffled relaxed possessed even equal equable dispassionate disciplined cool-headed collected chilled centered harmonious impassive poised placid phlegmatic pacific nonplussed nonchalant nerveless mellow limpid breezy