| concern | (noun) something that interests you because it is important or affects you | - |
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| (noun) something or someone that causes anxiety; a source of unhappiness | Synonyms: headache, vexation, worry |
| (noun) a feeling of sympathy for someone or something | - |
| (noun) an anxious feeling | Synonyms: care, fear |
| (noun) a commercial or industrial enterprise and the people who constitute it | Synonyms: business, business concern, business organisation, business organization |
| unconcern | (noun) the trait of remaining calm and seeming not to care; a casual lack of concern | Synonyms: indifference, nonchalance |
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| (noun) a feeling of lack of concern | - |