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. Grundy of the working class.
"I" is here introduced to personify the world in general--the Mrs. Grundy of each respected reader's private circle--every one of whom can point to some families of his acquaintance who live nobody knows how.
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. Grundy. She regarded the new abode as a baby house on a large scale, where she was allowed to play her part in the most satisfactory manner.
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. Grundy.
Much against her will, Jo at length consented to sacrifice a day to Mrs. Grundy, and help her sister through what she regarded as `a nonsensical business'.