It’s irresistible, the profanity delivered in considerable doses by British actors, the tremendously talented Olivia Colman among them, in “Wicked Little Letters.”

We can’t repeat much of it here, for we are FAR too polite, but know that a complex adjective that begins with “foxy” and ends with a three-letter word for one’s rear end is used repeatedly — before, for example, “old” and a five-letter word for prostitute — and to great comedic effect.

To fully understand this particular appeal of the film, know also that “Wicked Little Letters” is set in post-World War I England, in a seaside town not remotely accustomed to this type of language.

Fortunately, the mystery-based romp inspired by what apparently was an actual ordeal that generated nationwide interest — “This is more true than you’d think,” the film’s opening on-screen text promises about this tale of insulting letters being sent to women anonymously — has more to offer than that, starting with the performances of Colman and co-star Jessie Buckley.

Colman portrays Edith Swan, a never-married woman living with her mother and father, while Buckley is Rose Gooding, an Irish woman who moves in next door with her daughter, Nancy (Alisha Weir), and her new love, Bill (Malachi Kirby).

Rose is a stranger neither to a good time nor profanity, and Edith attempts to take Rose under her wing a bit by showing her what it means to be a respectable woman in Littlehampton. Rose is only so receptive, but the two become friends.

That is until Rose has a run-in with Edith’s strict and frequently disapproving dad, Edward (a delightfully loathsome Timothy Spall), at the latter’s birthday party.

It is after this public dustup when Edith begins receiving the oh-so-colorful letters, calling her this, that and the other.

It must be Rose! Who else?!?

Timothy Spall’s Edward confronts Jessie Buckley’s Rose ina scene from “Wicked Little Letters.” (Courtesy of Sony Pictures Classics)

The police are convinced, or at least the male cops are. However, Police Officer Gladys Moss (Anjana Vasan, “Cyrano”) — or, as she’s commonly referred to by her dismissive colleagues, “Woman Police Officer Gladys Moss” — isn’t so sure based on the handwriting of the letter writer and Rose’s. The case isn’t hers, though, and she’s told by her boss, Chief Constable Spedding (Paul Chahidi), to stick to her duties and to remember her place.

Of course, she’s not going to do that. The daughter of a cop and a believer in justice being done, Gladys teams with other women in town to catch another suspect in the act.

Joanna Scanlan, top, as Ann, and Anjana Vasan, as Gladys Moss, share a scene in “Wicked Little Letters.” (Courtesy of Sony Pictures Classics)

Directed by Thea Sharrock and penned by Jonny Sweet, “Wicked Little Letters” keeps you guessing as to the writer’s identity for only so long, shifting to a court case with a twist or two.

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All in all it’s largely entertaining fare from Sharrock, best known for 2016’s “Me Before You” and whose decent film “The Beautiful Game” debuted on Netflix only last week. She is aided by collaborators including editor Melanie Oliver, who helps keep the affair jaunty, as well as cinematographer Ben Davis and Isobel Waller-Bridge, who, among others, add to its period charm.

Meanwhile, the screenplay by Sweet — a comedian and writer whose credits include the comedy narrative series “Together” and an upcoming novel, “The Kellerby Code” — is of the solid if unspectacular variety. Those profanity-laced attacks of the film’s namesake letters go quite a long way.

So, too, do the on-screen efforts of Colman (“The Favourite,” “The Crown”), one of the film’s producers, and Buckley (“Men,” “Women Talking”). If the pairing sounds familiar, they portrayed the same woman at different points in her life in the excellent 2021 drama “The Last Daughter.”

‘The Lost Daughter’ an engrossing study of a woman haunted by her past | Movie review

Here, they get to shine together, with Buckley the standout if only because Rose is so much fun — even when she is faced with the possibility of losing the thing she cares most about in this world. (When “Die slut” is written on her door, Rose tells her daughter it’s a German phrase.)

Jessie Buckley appears in a scene from “Wicked Little Letters.” (Courtesy of Sony Pictures Classics)

Near the film’s conclusion, there is an especially fun, little, not-so-wicked exchange between Edith and Rose that we can’t describe — not, for once, because it is full of naughty language but because it would give too much away, and thus we would be worthy of being called an insulting name.

Probably not a “fox-(blank) old (blank)” … but something.

‘Wicked Little Letters’

Where: Theaters.

Rated: R for language throughout and sexual material.

Runtime: 1 hour, 40 minutes.

Stars (out of four): 3.