prohibitive

[proh-hib-i-tiv]
adjective
1.
serving or tending to prohibit or forbid something.
2.
sufficing to prevent the use, purchase, etc., of something: prohibitive prices.

Origin:
1595–1605; < Medieval Latin prohibitīvus. See prohibit, -ive

prohibitively, adverb
prohibitiveness, noun
nonprohibitive, adjective
nonprohibitively, adverb
unprohibitive, adjective
unprohibitively, adverb

prohibitive, prohibitory.
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World English Dictionary
prohibitive or prohibitory (prəˈhɪbɪtɪv, prəˈhɪbɪtərɪ, -trɪ)
 
adj
1.  prohibiting or tending to prohibit
2.  (esp of prices) tending or designed to discourage sale or purchase
 
prohibitory or prohibitory
 
adj
 
pro'hibitively or prohibitory
 
adv
 
pro'hibitiveness or prohibitory
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

prohibitive
c.1600, "having the quality of prohibiting," from prohibit + -ive. Of prices, rates, etc., "so high as to prevent use," it is from 1886.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for prohibitively
Historically, single atoms have been prohibitively small for scientific applications.
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