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say it: LENG-thee
lengthy is an adjective meaning "relatively long in duration; tediously protracted". It carries one recorded sense.
relatively long in duration; tediously protracted
“a drawn-out argument”
“an extended discussion”
“a lengthy visit from her mother-in-law”
“a prolonged and bitter struggle”
“protracted negotiations”
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 lengthy 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.