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Infallible Latin   Incapable An  Adjective  Not Error Unerring 

Title infallible
Text
Merriam-Webster's Collegiate Dictionary
in·fal·li·ble

 \\(ˌ)in-ˈfa-lə-bəl\\ adjective
 ETYMOLOGY  Middle English, from Medieval Latin infallibilis,from Latin in- + Late Latin fallibilis fallible
 DATE  15th century
1. incapable of error : 
unerring
    an infallible memory
2. not liable to mislead, deceive, or disappoint : 
certain
    an infallible remedy
3. incapable of error in defining doctrines touching faith or morals
• in·fal·li·bil·i·ty 
 \\-ˌfa-lə-ˈbi-lə-tē\\ noun
• in·fal·li·bly 
 \\-ˈfa-lə-blē\\ adverb
English Etymology
infallible
  1491, from M.L. infallibilis, from in- "not" + fallibilis (see fallible). In reference to Popes, attested from 1870.
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
infallible
in·fal·lible in5fAlEbl / adjective1. never wrong; never making mistakes
   永无过失的;一贯正确的:
   infallible advice 
   无可指责的忠告 
   Doctors are not infallible. 
   医生并非永不犯错。 
   OPP  
fallible
 
2. that never fails; always doing what it is supposed to do
   绝对可靠的;万无一失的:
   an infallible method of memorizing things 
   百试百灵的记忆方法 
 in·fal·li·bil·ity in7fAlE5bilEti / noun [U] :
   papal infallibility 
   教宗不能错误说 
 in·fal·libly -Ebli / adv.
Merriam-Webster's Collegiate Thesaurus-11th Edition
adj. Function: adjective 

1 incapable of being in error FF1C;an infallible ear for pitch in musicFF1E; 
Synonyms: inerrable, inerrant, sure, unerring 
Related Words: faultless, flawless, impeccable, undeceivable; correct, exact, perfect 
Contrasted Words: deceivable, faulty, unsure; doubtful, dubious, questionable 
Antonyms: fallible 
2 not liable to mislead, deceive, or disappoint FF1C;an infallibleremedyFF1E; 
Synonyms: certain, sure, surefire, unfailing 
Related Words: effective, efficacious, efficient; handy, helpful, useful; acceptable, agreeable, satisfying; satisfactory 
Contrasted Words: doubtful, questionable, uncertain, unsure; useless, worthless; unacceptable, unsatisfying; unsatisfactory 
Antonyms: fallible
Webster's Third New International Dictionary, Unabridged
in·fallible
\(ˈ)in, ən+\ adjective
Etymology: Medieval Latin infallibilis, from Latin in- in- (I) + Late Latin fallibilis fallible — more at 
fallible
1. : not fallible : incapable of error : 
unerring
 infallible marksman >
 infallible ear for pitch in music >
 infallible memory >
2. : not liable to mislead, deceive, or disappoint : 
sure
certain
indubitable
 infallible remedy >
 < his accent is an almost infallible index of his family background and education — Richard Joseph >
 infallible scheme for making money >
3. : incapable of error in defining doctrines touching faith or morals
Synonyms: 
 
inerrable
inerrant
unerring
infallible
 describes that which is exempt from possibility of error or mistake or that which has been errorless
  < no mathematician is infallible; he may make mistakes — A.S.Eddington >
  < believed in an infallible Bible — W.W.Sweet >
  
inerrable
 and 
inerrant
 are erudite synonyms for 
infallible
sometimes used in its stead to escape connotations arising from the discussion of papal infallibility; the latter may imply that whatever is described has not so far erred
  < the Church was ubiquitous, omniscient, theoretically inerrant and omnicompetent — G.G.Coulton >
  < at the moment we lack, in all English-speaking countries, the inerrant literary sense which gave us the Prayer Book Collects, often quite as beautiful in translation as in the original Latin — W.L.Sperry >
  
unerring
 may imply freedom from error coupled with sureness, reliability, and exactness
  < an unerring marksman >
  < a man's language is an unerring index of his nature — Laurence Binyon >
  < the unerring scent of the hounds in pursuit — George Meredith >

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