勤惰[kinda] diligence and indolence
惰力[daryoku] inertia
惰気[daki] indolence
惰性[dasei] inertia
惰眠[damin] indolence

怠惰[taida] laziness
惰弱[dajaku] apathetic
遊惰[yuuda] indolence
嬾惰[raida] lazy

懶ける[namakeru] to be idle
懶け者[namakemono] lazy person
懶い[monoui] languid
樹懶[namakemono] sloth (Sth. Am. tree-dwelling mammal)
懶熊[namakeguma] sloth bear (Melursus ursinus)

懶惰[randa] lazy
三指樹懶[miyubinamakemono] three-toed sloth
二指樹懶[futayubinamakemono] two-toed sloth
懶げ[monouge] languorous