Mrs. Grundy

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Mrs. Grun·dy

An extremely conventional or priggish person.

[After Mrs. Grundy, , character alluded to in the play Speed the Plough by Thomas Morton (1764-1838), British playwright.]
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Mrs. Grundy

A person who is too much concerned with being proper, modest, or righteous:
Informal: old maid.
References in classic literature ?
For the first time she was overstepping the bounds laid down by that harshest of tyrants, the Mrs.
It is the race heritage, the sadness which has made the race sober-minded, clean-lived and fanatically moral, and which, in this latter connection, has culminated among the English in the Reformed Church and Mrs.
Maud, being relieved from the fear of back-door beggary, soon became reconciled to bankruptcy; thought it rather a good joke, on the whole, for children like novelty, and don't care much for Mrs.