[ad-vurs, ad-vurs]
unfavorable or antagonistic in purpose or effect: adverse criticism.
opposing one's interests or desire: adverse circumstances.
being or acting in a contrary direction; opposed or opposing: adverse winds.
opposite; confronting: the adverse page.

1350–1400; Middle English < Anglo-French, Old French advers < Latin adversus hostile (past participle of advertere), equivalent to ad- ad- + vert- turn + -tus past participle suffix, with -tt- > -s-

adversely, adverb
adverseness, noun
unadverse, adjective
unadversely, adverb
unadverseness, noun

adverse, averse (see usage note at the current entry).

1. hostile, inimical, unfriendly. 2. unfavorable; unlucky, unfortunate; disastrous, calamitous, catastrophic. See contrary.

1–3. favorable.

The adjectives adverse and averse are related both etymologically and semantically, each having “opposition” as a central sense. Adverse is seldom used of people but rather of effects or events, and it usually conveys a sense of hostility or harmfulness: adverse reviews; adverse winds; adverse trends in the economy. Related nouns are adversity and adversary: Adversities breed bitterness. His adversaries countered his every move. Averse is used of persons and means “feeling opposed or disinclined”; it often occurs idiomatically with a preceding negative to convey the opposite meaning “willing or agreeable,” and is not interchangeable with adverse in these contexts: We are not averse to holding another meeting. The related noun is aversion: She has a strong aversion to violence. Averse is usually followed by to, in older use occasionally by from. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adverse (ˈædvɜːs, ædˈvɜːs)
1.  antagonistic or inimical; hostile: adverse criticism
2.  unfavourable to one's interests: adverse circumstances
3.  contrary or opposite in direction or position: adverse winds
4.  Compare averse (of leaves, flowers, etc) facing the main stem
[C14: from Latin adversus opposed to, hostile, from advertere to turn towards, from ad- to, towards + vertere to turn]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., from O.Fr. avers (Mod.Fr. adverse), from L. adversus "turned against," thus "hostile," pp. of advertere, from ad- "to" + vertere "to turn" (see versus).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The smaller operators are also being adversely affected by shifts within the
The same problem is beginning to adversely affect academe.
Industrial production may be adversely affected in the interim.
Pollution occurs when a material is added to a body of water or an area of land
  that adversely affects it.
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