怠慢【たいまん】
negligence, neglect, carelessness, procrastination
怠る【おこたる】
to neglect, to be negligent in, to be neglectful of, to fail to do, to leave undone, to avoid (doing), to shirk, to be unmindful of, to improve (of an illness), to get better
怠け者【なまけもの】
lazy person, lazy fellow, slothful person
怠惰【たいだ】
lazy, idle, indolent, slothful
倦怠【けんたい】
weariness, fatigue, languor, boredom, tedium, ennui