stu·di·ous
/ˈst(y)o͞odēəs/
adjective
  • spending a lot of time studying or reading.
    "he was quiet and studious"
    synonyms: scholarly, academic, bookish, intellectual, erudite, learned, donnish
  • done deliberately or with a purpose in mind.
    "his studious absence from public view"
    synonyms: deliberate, willful, conscious, intentional
  • showing great care or attention.
    "a studious inspection"
    synonyms: diligent, careful, attentive, assiduous, painstaking, thorough, meticulous
Source: google.com