/ɪn'vælɪd; ɪn`vælɪd/
adj
1 not properly based or able to be upheld by reasoning 无适当根据的; 无道理的; 站不住脚的
*an invalid argument, assumption, claim, etc 站不住脚的论据、没有根据的假定、没有道理的要求.
2 not usable; not officially acceptable (because of an incorrect detail or details); not legally recognized 无用的; 不能正式接受的; 法律上不承认的; 无效的
*A passport that is out of date is invalid. 护照过期是无效的.
* an invalid will 无效的遗嘱
* declare a marriage invalid 宣布一婚姻在法律上无效.

/'ɪnvəlɪd, 'ɪnvəli:d; `ɪnvəlɪd/
n person weakened through illness or injury; one who suffers from ill health for a very long time 病弱者; 伤残者; 久病者
*He has been an invalid all his life. 他终身残废.
* [attrib 作定语] her invalid mother, father, etc 她那长期抱病的母亲、父亲等
* an invalid diet, ie one planned for an invalid 伤病残者的规定饮食
* an invalid chair, ie one with wheels on for moving an invalid easily 轮椅.

v
1 (idm 习语) invalid sb `home send sb (esp a soldier) home (esp from abroad) because of ill health （因健康恶劣）遣送某人（尤指士兵）回家（尤指回国）.
2 (phr v) invalid sb out (of sth) cause sb to leave (esp the armed forces) because of ill health （因健康恶劣）使某人离去, （尤指）退役
*He was invalided out of the army because of the wounds he received. 他因负伤而退役.