Invalidly

[in-val-id] /ɪnˈvæl ɪd/

adjective
1.
not valid; without force or foundation; indefensible.
2.
deficient in substance or cogency; weak.
3.
void or without legal force, as a contract.
/ˈɪnvəˌliːd; -lɪd/
noun
1.

adjective
2.
suffering from or disabled by injury, sickness, etc
verb (transitive)
3.
to cause to become an invalid; disable
4.
(usually foll by out; often passive) (mainly Brit) to require (a member of the armed forces) to retire from active service through wounds or illness
/ɪnˈvælɪd/
adjective
1.
not valid; having no cogency or legal force
2.
(logic) (of an argument) having a conclusion that does not follow from the premises: it may be false when the premises are all true; not valid
adj.

“not strong, infirm,” 1640s, from Latin invalidus “not strong, infirm, weak, feeble,” from in- “not” (see in- (1)) + validus “strong” (see valid). Specific meaning “infirm from sickness, disease, or injury” is from 1640s.

“of no legal force,” 1630s, from special use of Latin invalidus (see invalid (adj.1)).
n.

1709, originally of disabled military men, from invalid (adj.1). Invalides is short for French Hôtel des Invalides, home for old and disabled soldiers in the 7th arrondissement of Paris.

invalid in·va·lid1 (ĭn’və-lĭd)
n.
One who is incapacitated by a chronic illness or disability. adj.
Incapacitated by illness or injury.

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Invaluably
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Invar
[in-vahr] /ɪnˈvɑr/ Trademark. 1. a brand of iron alloy containing 35.5 percent nickel and having a very low coefficient of expansion at atmospheric temperatures. /ɪnˈvɑː/ noun 1. trademark an alloy containing iron (63.8 per cent), nickel (36 per cent), and carbon (0.2 per cent). It has a very low coefficient of expansion and is used […]

Invariability
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Invariable
[in-vair-ee-uh-buh l] /ɪnˈvɛər i ə bəl/ adjective 1. not ; not changing or capable of being changed; static or constant. noun 2. something that is invariable; a constant. /ɪnˈvɛərɪəbəl/ adjective 1. not subject to alteration; unchanging noun 2. a mathematical quantity having an unchanging value; a constant adj. early 15c., from Old French invariable (14c.) […]