Learn That Word

Synonyms for Unconcerned (same or very similar meaning)

WordNet sense 1 (showing no care or concern in attitude or action):
indifferent

WordNet sense 2 (showing lack of emotional involvement):
detached

WordNet sense 3 (marked by blithe unconcern):
insouciant, nonchalant

WordNet sense 4 (lacking or showing a lack of due concern):
blithe


From the ODE community, based on WordNetadd/edit