austerest
adjective
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Grim or severe in manner or appearance
"The headmistress was an austere old woman."
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Lacking decoration; trivial; not extravagant or gaudy
"The interior of the church was as austere as the parishioners were dour."
Synonyms:
forbidding, stern, strict, plain, simple, unadorned, unembellished
Antonyms:
extravagant, flamboyant, flashy, gaudy, overwrought