adj.
Pronunciation: in- ' f ə rm
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