overconscientious

From over- +‎ conscientious.

• (UK) IPA^(key): /ˌəʊvəkɒnʃiːˈɛnʃəs/

overconscientious (comparative more overconscientious, superlative most overconscientious)

1. Excessively conscientious.
   • 1603, Michel de Montaigne, “Observations concerning the meanes to warre after the maner of Iulius Cæsar”, in John Florio, transl., The Essayes […], book II, London: […] Val[entine] Simmes for Edward Blount […], →OCLC, page 422:

     If he were not over conſciencious in that, vnder colour of ſome treatie, parlie or accord, to take any advantage of his enemies: he was as little ſcrupulous, in that he required no other vertue in his Souldiers, but valour; […]

   • 2001 March 15, James Meikle, “Fussing can double risk of heart attack”, in Alan Rusbridger, editor, The Guardian‎^[1], London: Guardian News & Media, →ISSN, →OCLC, archived from the original on 10 May 2014:

     Are you an obsessive lover of routine, overconscientious, and think cleanliness is next to godliness? Beware. You may be nearly twice as likely to die from a heart attack as more laid back friends and colleagues.