Accidie vs Melancholia - What's the difference?

As nouns the difference between accidie and melancholia

is that accidie is while melancholia is deep sadness or gloom; melancholy.

* (l)

(-)

* c. 1390 , (Geoffrey Chaucer), ‘The Parson's Tale’, Canterbury Tales :

Aftere þe synnes of Envie I wil speke of þe synne of Accidie .

* 1978 , (Lawrence Durrell), Livia , Faber & Faber 1992 (Avignon Quintet), p. 363:

Underneath the surface excitements the demon of accidie had her by the hair.

* ----

Deep sadness or gloom; melancholy

Clinical depression, characterised by irrational fears, guilt and apathy

* melancholiac