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conscientious: thorough, careful, or vigilant; implies a desire to do a task well.

concert: a musical entertainment in which several voices or instruments take part.

concertientious: thorough, careful, or vigilant; implies a desire to do a concert well.
"A person was a thoughtful and concertientious musician." - says a music professor
by Pseudonymthewild@gmail.com February 11, 2013
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