done completely; with great attention to detail 彻底的；完全的；深入的；细致的 - [not usually before noun]
(of a person 人 doing things very carefully and with great attention to detail 仔细周到；工作缜密 She's very thorough and conscientious. 她勤勤恳恳，一丝不苟。 He was determined to be thorough in his research. 他决心做研究一丝不苟。
- (British English, informal)
used to emphasize how bad or annoying somebody/something is 十足的；彻头彻尾的；完完全全的
Word OriginOld English thuruh, alteration of thurh ‘through’. Original use was as an adverb and preposition, in senses of through. The adjective dates from the late 15th cent., when it also had the sense ‘that goes or extends through something’, surviving in thoroughfare.