Unconcern n. : Want of concern; absence of anxiety; freedom from solicitude; indifference.

Example:
What do you do to an Unconcern person that contenue to want to be in a relation ship?

Taxonomy
unconcern, Synonyms, indifference, Houghton Mifflin Company, Lack of interest, back-formation, Thesaurus, WordNet, Translations, apathy, Unanswered questions, disinterest, impassivity, incuriosity, Português, 中文, Chinese, the American.

Defination from the web:
unconcern ( ) n. Lack of interest; indifference. Lack of worry or apprehensiveness. [Probably back-formation from UNCONCERNED ... WordNet: unconcern. Top. Home > Library > Literature & Language > WordNet. Note: click on a word meaning below to see its connections and related words. ...