"not strong, infirm," 1640s, from Latin invalidus "not strong, infirm, weak, feeble," from in- "not" (see in- (1)) + validus "strong" (see valid). Specific meaning "infirm from sickness, disease, or injury" is from 1640s.
invalid (adj.2)
"of no legal force," 1630s, from special use of Latin invalidus (see invalid (adj.1)).
invalid (n.)
1709, originally of disabled military men, from invalid (adj.1). Invalides is short for French Hôtel des Invalides, home for old and disabled soldiers in the 7th arrondissement of Paris.
权威例句
1. Margaret resides with her invalid mother in a London suburb.
玛格丽特同她病弱的母亲住在伦敦郊区。
2. At best Nella would be an invalid; at worst she would die.
内拉往好里说会落下残疾,往坏处说可能会生命不保。
3. The treaty was declared invalid because it had not been ratified.
条约没有得到批准,因此被宣布无效。
4. A passport that is out of date is invalid.
护照过期是无效的.
5. Dr. Smith looked in on the invalid the day before yesterday.
【invalid, crisp, fragile, brittle, frail】
这组词都有“弱”的意思,其区别是:
invalid: a.不正确的,缺乏证据的;无效的,作废的。作名词时,表示病弱者,伤残者,久病者。
• Your ideas about the first humans are interesting but invalid. 你关于最早的人类的观点很有意思,但是缺乏证据。
• A bad car accident made him an invalid. 一次严重的车祸使他变成了残疾。
crisp: a.指食品的松脆;清新的,爽快的;活跃的,有生气的,干净利落的。
• crisp biscuit 松脆的饼干
• The student gave a clear, crisp answer to the teacher's question. 学生干净利落地回答了老师的问题。
fragile: a.常常修饰使用时必须小心才不会破碎的东西,也引申为体弱的,虚弱的。
• He 's feeling a bit fragile after last night's party. 他参加了昨晚的聚会以后,现在感觉有些虚弱。
brittle: a.易碎的,易损坏的,通常是指坚硬的东西。
• The bones of elderly people become brittle and easily broken. 老年人的骨头变得脆弱,很容易骨折。
frail: a. (指人)体弱的,虚弱的,也可以指东西易碎的。
• His mother has grown old and frail. 他母亲已经年老体弱。