| invalid | (verb) injure permanently | Synonyms: disable, handicap, incapacitate |
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| (verb) force to retire, remove from active duty, as of firemen | - |
| invalidate | (verb) take away the legal force of or render ineffective | Synonyms: vitiate, void |
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| (verb) show to be invalid | Synonyms: nullify |
| (verb) make invalid for use | Synonyms: cancel |
| (verb) declare invalid | Synonyms: annul, avoid, nullify, quash, void |
| validate | (verb) make valid or confirm the validity of | - |
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| (verb) prove valid; show or confirm the validity of something | - |
| (verb) give evidence for | Synonyms: corroborate |
| (verb) declare or make legally valid | Synonyms: formalise, formalize |