Diligent vs Austere - What's the difference?

As adjectives the difference between diligent and austere

is that diligent is performing with intense concentration, focus, responsible regard while austere is austere.

(en adjective)

Performing with intense concentration, focus, responsible regard.

* See also

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(en-adj)

Grim or severe in manner or appearance

The headmistress was an austere old woman.

Lacking trivial decoration; not extravagant or gaudy

The interior of the church was as austere as the parishioners were dour.

* (grim or severe) stern, strict, forbidding * (lacking trivial decoration) simple, plain, unadorned, unembellished

* (not lacking trivial decoration) overwrought, flamboyant, extravagant, gaudy, flashy

* austerity * austerely