blithely unconcerned:
dissatisfied,
distressed,
troubled,
disconsolate,
worried,
discontented,
upset.
noun:
high-strung,
formal,
heedful,
cautious,
careful,
wary,
rigid,
uptight,
concerned,
overburdened,
ceremonious,
jumpy,
bothered,
grave,
skittish,
somber,
earnest,
nervous,
tense,
decorous,
strict,
long-suffering,
sorrowful,
responsible,
jittery.
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