of, pertaining to, or consisting in theory; not practical (distinguished from applied ).
existing only in theory; hypothetical.
given to, forming, or dealing with theories; speculative.
Also, theoretic.

1610–20; theoretic (< Late Latin theōrēticus < Greek theōrētikós, equivalent to theōrēt(ós) to be seen (verbid of theōreîn to view) + -ikos -ic) + -al1

theoretically, adverb
antitheoretical, adjective
antitheoretically, adverb
nontheoretic, adjective
nontheoretical, adjective
nontheoretically, adverb
untheoretic, adjective
untheoretical, adjective
untheoretically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
theoretical or theoretic (ˌθɪəˈrɛtɪkəl, ˌθɪəˈrɛtɪk)
1.  of or based on theory
2.  lacking practical application or actual existence; hypothetical
3.  using or dealing in theory; impractical
theoretic or theoretic
theo'retically or theoretic

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

1616, from L.L. theoreticus "of or pertaining to theory" (c.397), from Gk. theoretikos "contemplative, pertaining to theory" (by Aristotle contrasted to praktikos), from theoretos "that may be seen or considered," from theorein "to consider, look at" (see theory).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

theoretical the·o·ret·i·cal (thē'ə-rět'ĭ-kəl)

  1. Of, relating to, or based on theory.

  2. Restricted to theory; not practical.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Those theoretical days were long past by the time explorers and settlers
  crossed the desert.
Don't accept theoretical replacement parts: ask the dealer if they keep them in
How rarely one can come to a theoretical agreement with anyone else on a
  fundamental principle.
So much for the theoretical distinction between the three tendencies.
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