Synonyms of unperturbed

1 Syllable
calm
2 Syllables
certain, tranquil, placid
3 Syllables
questionless, unflurried, unstirred, unworried, nonchalant, serene, untroubled, collected, unfazed, unvexed, composed
4 Syllables
unbothered, undisturbed, unflustered, unexcited, unconcerned
5 Syllables
unagitated, unimpressible, disimpassioned, unperturbable