1) An impractical theorist 2) French word used in English 3) Hair-splitter 4) Informative 5) Instructive 6) Nit-picker 7) Obfuscator 8) Obscurantist 9) Scholar 10) Sophist 11) Theoretician 1) Dogmatic 2) Dogmatist 3) Finicky 4) Inflexible 5) Instructive 6) Ismal 7) Pedantic 8) Rigid 
• (n.) One who would apply to political or other practical concerns the abstract doctrines or the theories of his own philosophical system; a propounder of a new set of opinions; a dogmatic theorist. Used also adjectively; as, doctrinaire notions.
Theorist who pays no regard to practical considerations, generally a political ideologist. The term is of French origin, and was applied to a group of politicians at the time of the Restoration...
Doc`tri·naire' noun [ French See Doctrine .] One who would apply to political or other practical concerns the abstract doctrines or the theories of his own philosophical system; a propounder of a new set of opinions; a dogmatic theorist. Used also adjectively; as, doctrinaire notions...
[adj] - stubbornly insistent on theory without regard for practicality or suitability
adjective stubbornly insistent on theory without regard for practicality or suitability
a person who tries to apply some doctrine or theory without sufficient regard for practical considerations; an impractical theorist.
[Difficult words] a stubborn person of arbitrary or arrogant opinions[Obscure words] a stubborn person of arbitrary or arrogant opinions