as if nothing had happened [were the matter]
平気でいる
be unconcerned 《about》
do not care 《about》
平気を装う
put on [【形式ばった表現】 assume] an unconcerned [a nonchalant] air
【形式ばった表現】 feign indifference
読み方 へいき
1
Unconcern; calmness; serenity; composure; coolness; indifference; carelessness; nonchalance; sang-froid:(=な) unconcerned; calm; serene; composed; cool; indifferent; careless; nonchalant; unmoved; imperturbable:(=で) calmly; coolly; serenely; caressly; unconcernedly; with unconcern; with indifference; with nonchalance; with sang-froid
2