| ineffective |
| 1. adj. not having the desired effect; ineffectual | |
| 2. adj. lacking in ability; incompetent or inadequate | |
| invalid |
| 1. adj. Not valid; not true, correct, acceptable or appropriate. | |
| Your argument is invalid because it uses circular reasoning. | |
| This invalid contract cannot be legally enforced. | |
| 2. n. (dated, sometimes offensive) Any person with a disability or illness. | |
| 3. n. (dated, sometimes offensive) A person who is confined to home or bed because of illness, disability or injury; one who is too sick or weak to care for themselves. | |
| 4. n. (archaic) A disabled member of the armed forces; one unfit for active duty due to injury. | |
| 5. adj. Intended for use by an invalid. | |
| 6. v. (UK, transitive) To exempt from duty because of injury or ill health. | |
| He was invalided home after the car crash. | |
| 7. v. To make invalid or affect with disease. | |
| or |
| 1. conj. Connects at least two alternative words, phrases, clauses, sentences, etc. each of which could make a passage true. In English, this is the "inclusive or." The "exclusive or" is formed by "either(...) | |
| In Ohio, anyone under the age of 18 who wants a tattoo or body piercing needs the consent of a parent or guardian. | |
| He might get cancer, or be hit by a bus, or God knows what. | |
| 2. conj. (logic) An operator denoting the disjunction of two propositions or truth values. There are two forms, the inclusive or and the exclusive or. | |
| 3. conj. Counts the elements before and after as two possibilities. | |
| 4. conj. Otherwise (a consequence of the condition that the previous is false). | |
| It's raining! Come inside or you'll catch a cold! | |
| 5. conj. Connects two equivalent names. | |
| The country Myanmar, or Burma | |
| 6. n. (logic, electronics) alternative form of OR | |
| 7. n. (tincture) The gold or yellow tincture on a coat of arms. | |
| 8. adj. (tincture) Of gold or yellow tincture on a coat of arms. | |
| 9. adv. (obsolete) Early (on). | |
| 10. adv. (obsolete) Earlier, previously. | |
| 11. prep. (now archaic, or dialect) Before; ere. | |
| futile |
| 1. adj. Incapable of producing results; doomed not to be successful; not worth attempting. | |
