unfrictional

frictional

[frik-shuh-nl]
adjective
1.
of, pertaining to, or of the nature of friction.
2.
moved, worked, or produced by friction.

Origin:
1840–50; friction + -al1

frictionally, adverb
unfrictional, adjective
unfrictionally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
frictional

adjective
pertaining to or worked or produced by friction; "frictional electricity"; "frictional heat"; "frictional gearing" 
WordNet® 3.0, © 2006 by Princeton University.
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