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say it: THUR-oh
thorough is an adjective meaning "painstakingly careful and accurate". It carries 3 recorded senses.
performed comprehensively and completely; not superficial or partial
“an exhaustive study”
“made a thorough search”
“thoroughgoing research”
without qualification; used informally as (often pejorative) intensifiers
“an arrant fool”
“a complete coward”
“a consummate fool”
“a double-dyed villain”
“gross negligence”
“a perfect idiot”
“pure folly”
“what a sodding mess”
“stark staring mad”
“a thorough nuisance”
“a thoroughgoing villain”
“utter nonsense”
“the unadulterated truth”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for thorough come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.