adj.

1. Incapable of erring: an infallible guide; an infallible source of information.
2. Incapable of failing; certain: an infallible antidote; an infallible rule.
3. Roman Catholic Church. Incapable of error in expounding doctrine on faith or morals.

[Middle English, from Medieval Latin īnfallibilis : Latin in-, not; see in–¹ + Medieval Latin fallibilis, fallible; see fallible.]

infallibility in·fal'li·bil'i·ty or in·fal'li·ble·ness n.
infallibly in·fal'li·bly adv.

adjective

Such as could not possibly fail or disappoint: certain, secure, sure, unerring, unfailing. Informal sure-fire. See certain/uncertain.

adj

Definition: unerring, dependable
Antonyms: erring, fallible, faulty, imperfect

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IN BRIEF: Incapable of error.

The only infallible rule we know is, that the man who is always talking about being a gentleman never is one. — Robert Surtees (1803-1864), English novelist.

Dansk (Danish)
adj. - sikker, ufejlbarlig, usvigelig

Nederlands (Dutch)
onfeilbaar

Français (French)
adj. - infaillible
n. - l'infaillible

Deutsch (German)
adj. - unfehlbar
n. - jmd. od. etwas Unfehlbares

Ελληνική (Greek)
adj. - αλάθητος, αλάνθαστος
n. - (ο) αλάνθαστος

Italiano (Italian)
infallibile

Português (Portuguese)
adj., -
n. - infalível

Русский (Russian)
непогрешимый, безотказный

Español (Spanish)
adj. - infalible
n. - infalible, persona o cosa infalible

Svenska (Swedish)
adj. - ofelbar, osviklig, säker
n. - ofelbar person el. sak

中文（简体） (Chinese (Simplified))
绝无错误的, 绝对可靠的

中文（繁體） (Chinese (Traditional))
adj. - 絕無錯誤的, 絕對可靠的

한국어 (Korean)
adj. - 전혀 오류가 없는, 반드시 일어나는

日本語 (Japanese)
adj. - 全く誤りのない, 絶対確実な
n. - 絶対確実な人

العربيه (Arabic)
‏(صفه) معصوم, لا يخطئ (الاسم) المعصوم عن الخطأ‏

עברית (Hebrew)
adj. - ‮שאינו טועה, יעיל, טוב, בדוק ומנוסה‬

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