Adjektive

sloth [pl. sloths]
lazy [ lazier ; laziest]
indolence [pl. indolences]
idle [ more idle ; most idle]

Noun

inaction [pl. inactions]
slothfulness [pl. slothfulnesses]
lethargy [pl. lethargies]
lassitude [pl. lassitudes]
remissness [pl. remissnesses]