illogicality as a consequence of having a conclusion that does not follow from the premisses

declare invalid

Containing no matter; empty, Ineffective; useless, Games Lacking cards of a particular suit in a dealt hand, noun_ An empty space, A feeling or state of emptiness, loneliness, or loss, An opening; a solution of continuity in an inclosure of any kind; a space unfilled or not built up, as contrasted with closed or occupied areas, intransitive verb_ To make void or of no validity; invalidate, To excrete body wastes, To be emitted or evacuated, transitive verb_ To remove the contents of; to make or leave vacant or empty; to quit; to leave, To throw or send out; to evacuate; to emit; to discharge, To render void; to make to be of no validity or effect; to vacate; to annul; to nullify

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, Any person with a disability, verb_ force to retire, remove from active duty, as of firemen, injure permanently, transitive verb_ To make or render invalid or infirm, To classify or enroll as an invalid, someone who is incapacitated by a chronic illness or injury, One who is confined to home or bed because of illness, disability or injury

in the fingering for stringed instruments, that the note over which it is placed is to be played on an open string, Something that has no force or meaning, One of the beads in nulled work, adjective_ Of no legal or binding force or validity; of no efficacy; invalid; void; nugatory; useless, (Computers) Unassigned or meaningless; -- a special value given to variables, especially pointers or logical variables, indicating that it is meaningless and cannot be used in computation. The actual value that is stored in memory to indicate the null condition may vary with the computer language used, absent or non-existent, transitive verb_ To make null, to nullify

remove or make invisible, postpone indefinitely or annul something that was scheduled, intransitive To annul or invalidate,To neutralize one another; counterbalance, transitive To invalidate or annul something, To offset or equalize something, noun_ The act or an instance of canceling; a cancellation, An order canceling or countermanding a previous order