Difference between Invalid and Inefficient

INVALID vs INEFFICIENT: NOUN

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

Incapable of, or indisposed to, effective action; habitually slack or remiss; effecting little or nothing
Not efficient; not producing the effect intended or desired, or achieiving the effect by unnnecessary and excessive expenditure of resources; inefficacious.
Wasteful of time, energy, or materials.
Not producing the intended result; ineffective.
Lacking the ability or skill to perform effectively; inadequate
Not producing desired results; wasteful
Not efficient, as.

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.

Inadequate
Wasteful
Not producing desired results
Not efficient; not producing or not capable of producing the desired effect; incapable; incompetent; inadequate: as, inefficient measures; an inefficient police.

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

Ineffectual, Useless, Unwieldy, Uneconomic, Unworkable, Counterproductive, Efficient, Inadequate, Unproductive, Cumbersome, Inefficiency, Incompetent, Uneconomical, Ineffective, Wasteful

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

Ineffectual, Useless, Unwieldy, Uneconomic, Unworkable, Counterproductive, Efficient, Inadequate, Unproductive, Cumbersome, Inefficiency, Incompetent, Uneconomical, Ineffective, Wasteful

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.

This will be very inefficient for the company.
Courts remained inefficient and routinely subject to corruption.
For example, most inefficient subject is Computer architecture.
Such externalities usually involve inefficient use of resources.
Admiral was surrounded by woefully inefficient legacy carriers.
Generic screening is inefficient in identifying quality problems.
Respondents concur that processes were inefficient and ineffective.
Economic practices inefficient in the global market disappear.
Due to inefficient logisticssolutions production process is extended.
Inefficient tax systems: ETR can reduce the economic costs of the tax system, which is especially desirable for countries with relatively inefficient tax systems.