Synonyms of thorough in English:

thorough


See definition of thorough

adjective

1‘a thorough investigation’

SYNONYMS
rigorous, in-depth, exhaustive, thoroughgoing, minute, detailed, close, meticulous, scrupulous, assiduous, conscientious, painstaking, methodical, careful, sedulous, complete, comprehensive, elaborate, full, intensive, extensive, widespread, sweeping, searching, all-embracing, all-inclusive
ANTONYMS

superficial, cursory, partial

2‘he is slow but thorough’

SYNONYMS
meticulous, scrupulous, assiduous, conscientious, painstaking, punctilious, methodical, careful, attentive, diligent, industrious, persevering, laborious, hard-working
ANTONYMS

careless

3‘the child is being a thorough nuisance’

SYNONYMS
utter, downright, thoroughgoing, absolute, complete, total, out-and-out, outright, real, perfect, profound, proper, consummate, all-out, wholesale, surpassing, sheer, rank, pure, unqualified, unmitigated
North American full-bore
British informal right
Australian, New Zealand informal fair
rare arrant, right-down