Main Entry: in·firm

Pronunciation: \in-ˈfərm\

Function: adjective

Etymology: Middle English, from Latin infirmus, from in- + firmus firm

Date: 14th century

1 : of poor or deteriorated vitality; especially : feeble from age
2 : weak of mind, will, or character : irresolute, vacillating
3 : not solid or stable : insecure

synonyms see weak

— in·firm·ly adverb