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proficient

[pruh-fish-uh nt] /prəˈfɪʃ ənt/
adjective
1.
well-advanced or competent in any art, science, or subject; skilled:
a proficient swimmer.
noun
2.
an expert.
Origin
1580-1590
1580-90; < Latin prōficient- (stem of prōficiēns) present participle of prōficere to advance, make progress, equivalent to prō- pro-1 + -ficere, combining form of facere to make, do1. See -ent, efficient
Related forms
proficiently, adverb
proficientness, noun
overproficient, adjective
overproficiently, adverb
underproficient, adjective
Synonyms
1. adept, competent, experienced, accomplished, able, finished.
Antonyms
1. unskilled, inept.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for underproficient

proficient

/prəˈfɪʃənt/
adjective
1.
having great facility (in an art, occupation, etc); skilled
noun
2.
an archaic word for an expert
Derived Forms
proficiency, noun
proficiently, adverb
Word Origin
C16: from Latin prōficere to make progress, from pro-1 + facere to make
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for underproficient

proficient

adj.

1580s, back-formation from proficiency or else from Old French proficient (15c.), from Latin proficientem (nominative proficiens), present participle of proficere "to make progress, go forward, effect, accomplish, be useful" (see proficiency). Related: Proficiently.

Online Etymology Dictionary, © 2010 Douglas Harper
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