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know-how (n)
know-it-all (n)
knowable (adj)
knowing (adj)
knowingly (adv)
knowledge (n)
knowledgeable (adj)
knowledgeably (adv)
known (adj)
knuckle (n)
knuckle down (v)
knuckle under (v)
kohl (n)
kosher (adj)
kowtow (n)
kowtow (v)
kudos (n)
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laborious (adj)
Synonyms: arduous, backbreaking, painstaking, protracted, lengthy, strenuous, hard, tough, painful, difficult

Antonym: easy
Encarta® World English Dictionary [World English Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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