Difference between Invalid and Illegal

INVALID vs ILLEGAL: NOUN

Someone who is incapacitated by a chronic illness or injury
An infirm or sickly person; one who is affected by disease or disabled by any infirmity.
Hence Something that is damaged, or the worse for wear, but not so much as to be wholly unserviceable.
A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health who is unable to care for himself.
One who is confined to home or bed because of illness, disability or injury
Any person with a disability.

Prohibited by law or by official or accepted rules
Prohibited by law.
Being an illegal immigrant; residing in a country illegally.
Totally fictitious, and often issued on behalf of a non-existent territory or country.
Prohibited by official rules.
Unacceptable to or not performable by a computer.
Not according to, or authorized by, law; specif., contrary to, or in violation of, human law; unlawful; illicit; hence, immoral
Contrary to or forbidden by law, especially criminal law.
Forbidden by established rules

Not valid; of no force, weight, or cogency; weak.
In law, having no validity or binding force; wanting efficacy; null; void: as, an invalid contract or agreement.
Deficient in health; infirm; weak; sick.
To affect with disease; render an invalid: chiefly in the past participle.
To register as an invalid; enroll on the list of invalids in the military or naval service; give leave of absence from duty on account of ill health.
To cause one's self to be registered as an invalid.

Synonyms Illegal, Felonious, etc. (See criminal.) Unlawful, Illegitimate, etc. (See lawful.)
Not legal; contrary to law; unlawful; illicit: as, an illegal act; illegal commerce.

Disable, Sophistic, Sophistical, False, Spurious, Void, Uncollectible, Specious, Fallacious, Nugatory, Expired, Unsound, Nullified, Invalidated, Null

Misbranded, Extrajudicial, Bootleg, Smuggled, Punishable, Outlaw, Ineligible, Criminal, Illegitimate, Contraband, Banned, Outlawed, Prohibited, Illicit, Unlawful

Disable, Sophistic, Sophistical, False, Spurious, Void, Uncollectible, Specious, Fallacious, Nugatory, Expired, Unsound, Nullified, Invalidated, Null

Misbranded, Extrajudicial, Bootleg, Smuggled, Punishable, Outlaw, Ineligible, Criminal, Illegitimate, Contraband, Banned, Outlawed, Prohibited, Illicit, Unlawful

Agreement is unenforceable or invalid shall not render any other provision of this Agreement unenforceable or invalid.
Use the Ignore Fields with Invalid Types property to replace data of invalid data types with default values.
Short error: Invalid Task Attribute Map Id or Invalid Task Attribute Value.
If any part of the regulations promulgated is declared invalid, all parts that are severable from the invalid parts shall remain in effect.
Once a thirdparty buys without actual knowledge of the invalid lien, that transaction will not be undone notwithstanding the invalid lien.
Directory does not automatically clean up invalid objects, but invalid objects and attributes appear in searches and can be deactivated manually.
Invalid Arrest Warrant: a criminal case WILL NOT be dismissed on the basis of an invalid arrest warrant.
Error Message: Invalid Warehouse or Warehouse Not Available You have entered an invalid warehouse.
If you enter an invalid path or name, a message appears indicating that the output MSI file name is invalid.
Will is invalid if the condition imposed is invalid or contrary to law.

Osuna talked about the problems of illegal immigration, including the recent police beating of several illegal immigrants.
Illegal Drugs: Any person suspected with or caught using illegal drugs before departure will not be allowed on the ride.
Notably, California has a general whistleblower protection statute that protects employees who disclose illegal activity or refuse to participate in illegal activities.
For instance, a contract may be considered illegal if it involves the sale and delivery of illegal narcotics.
You may not use your Debit Card for illegal online gambling or any other illegal transaction.
Buy narcotics or illegal goods and sell them wherever they are illegal to make huge profits.
Illegal drug use includes more than just illegal drugs such as marijuana, cocaine, or heroin.
Officers may seize any other illegal items found during the search, such as illegal narcotics.
Fair Lending or Other Illegal Credit Practices Review We found no evidence of illegal discrimination or other illegal credit practices.
If something is illegal somewhere, it must be illegal everywhere.