1 complete and unqualified; not superficial (needs a thorough change).
2 acting or done with great care and completeness (the report is most thorough).
3 absolute (a thorough nuisance).
Phrases and idioms:
thorough bass a bass part for a keyboard player with numerals and symbols below to indicate the harmony. thorough-paced
1 (of a horse) trained to all paces.
2 complete or unqualified.
Derivatives:
thoroughly adv. thoroughness n.
Etymology: orig. as adv. and prep. in the senses of through, f. OE thuruh var. of thurh THROUGH
Useful english dictionary. 2012.