Synonym: drawn-out, extended, prolonged, protracted. Similar words: length, at length, lengthways, strength, strengthen, seeing that, living thing, challenge. Meaning: ['leŋθɪ] 
adj. relatively long in duration; tediously protracted.
adj. relatively long in duration; tediously protracted. 271. The two leaders have been involved in lengthy diplomatic negotiations.
272. I was subjected to a lengthy inquisition into the state of my bank balance.
More similar words: length, at length, lengthways, strength, strengthen, seeing that, living thing, challenge, challenged, pithy, filthy, earthy, apathy, worthy, wealthy, healthy, empathy, stealthy, with young, allopathy, sympathy, owing to, antipathy, belong to, long-term, longtime, bring together, according to, engulf, avenge.