second nature

Noun

 * 1)  A mindset, skill, or type of behavior so ingrained through habit or practice that it seems natural, automatic, or without a basis in conscious thought.

Usage notes

 * Traditionally preceded by the indefinite article, but now usually used without an article.

Translations

 * Czech: druhá přirozenost
 * Finnish: toinen luonto
 * French:
 * Polish: druga natura
 * Russian: втора́я нату́ра
 * Spanish: segunda naturaleza