Whether sloth should be accounted a capital vice?

Objections

Objection 1 : It would seem that sloth ought not to be accounted a capital vice. For a capital vice is one that moves a man to sinful acts, as stated above (Question [34], Article [5]). Now sloth does not move one to action, but on the contrary withdraws one from it. Therefore it should not be accounted a capital sin.
Objection 2 : Further, a capital sin is one to which daughters are assigned. Now Gregory (Moral. xxxi, 45) assigns six daughters to sloth, viz. "malice, spite, faint-heartedness, despair, sluggishness in regard to the commandments, wandering of the mind after unlawful things." Now these do not seem in reality to arise from sloth. For "spite" is, seemingly the same as hatred, which arises from envy, as stated above (Question [34], Article [6]); "malice" is a genus which contains all vices, and, in like manner, a "wandering" of the mind after unlawful things is to be found in every vice; "sluggishness" about the commandments seems to be the same as sloth, while "faint-heartedness" and "despair" may arise from any sin. Therefore sloth is not rightly accounted a capital sin.
Objection 3 : Further, Isidore distinguishes the vice of sloth from the vice of sorrow, saying (De Summo Bono ii, 37) that in so far as a man shirks his duty because it is distasteful and burdensome, it is sorrow, and in so far as he is inclined to undue repose, it is sloth: and of sorrow he says that it gives rise to "spite, faint-heartedness, bitterness, despair," whereas he states that from sloth seven things arise, viz. "idleness, drowsiness, uneasiness of the mind, restlessness of the body, instability, loquacity, curiosity." Therefore it seems that either Gregory or Isidore has wrongly assigned sloth as a capital sin together with its daughters.