invalid

复数：invalids过去式：invalided过去分词：invalided现在分词：invaliding第三人称单数：invalids

1. 无适当根据的 not properly based or able to be upheld by reasoning
2. 无用的,无效的 not usable; not legally recognized
3. 有病的 be ill

1. [C]病人,残疾者 person weakened through illness or injury; one who suffers from ill health for a very long time

• invalid argument没有根据的论点
• invalid person有病的人

• marriage invalid婚姻无效

• visit an invalid看望病人

• bedridden invalid卧床不起的病人
• permanent invalid长期病人

invalid data无效数据；不正当数据

1. A passport that is out of date is invalid.
   护照过期是无效的。
2. Unless a check is signed, it is invalid.
   支票除非签了名，否则是无效的。
3. She looks after her invalid mother.
   她照看病弱的母亲。

1. Nobody looks after the invalid.
   没人照顾这个病人。
2. He never fully recovered, and had to spend the rest of his life as an invalid.
   他没能完全康复，于是不得不成了一名残疾者度过余生。

1. He was invalided out of the army because of the wounds he received.
   他因负伤而退役。
2. Ambassador decided that he must invalid his sick radio-officer home.
   大使决定把患病的无线电报员遣送回国。