accidie

from The Collaborative International Dictionary of English v.0.48

Accidie \Ac"ci*die\, n. [OF. accide, accidie, LL. accidia,
   acedia, fr. Gr. ?; 'a priv. + ? care.]
   Sloth; torpor. [Obs.] "The sin of accidie." --Chaucer.
   [1913 Webster]