ill and weak, especially over a long period or as a result of being old （长期）病弱的；年老体弱的 to grow old and infirm 变得年老体弱 Father was becoming increasingly infirm. 父亲越来越衰弱。
Oxford Collocations Dictionaryverbs- be
- become
- mentally
- physically
- the infirmnoun [plural]
people who are weak and ill for a long period 病弱的人；体弱的人 care for the elderly and infirm 对年老体弱者的照顾
Word Originlate Middle English (in the general sense ‘weak, frail’): from Latin infirmus, from in- ‘not’ + firmus ‘firm’.