proved, valid, accepted; see certain 3, established 3, guaranteed.
ingrained, seasoned, regular; see chronic, habitual 1. See syn. study at chronic.
"confirmed." YourDictionary, n.d. Web. 05 December 2018. <https://thesaurus.yourdictionary.com/confirmed>.
confirmed. (n.d.). Retrieved December 05th, 2018, from https://thesaurus.yourdictionary.com/confirmed
Subject to a disease or habit for a long time:
Firmly established by long standing:
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