painstaking
Concise Oxford English Dictionary © 2008 Oxford University Press:
painstaking/ˈpeɪnzteɪkɪŋ/
▶adjective done with or employing great care and thoroughness.
– derivatives
painstakingly adverb,
painstakingness noun.
painstakingly adverb,
painstakingness noun.
'painstaking' also found in these Oxford entries:

