"thorougher" in the adjective sense
1. thorough
painstakingly careful and accurate
"our accountant is thorough"
"thorough research"
2. exhaustive, thorough, thoroughgoing
performed comprehensively and completely not superficial or partial
"an exhaustive study"
"made a thorough search"
"thoroughgoing research"
3. arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, stark, staring, thorough, thoroughgoing, utter, unadulterated
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"
Source: WordNet® (An amazing lexical database of English)
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