Stiff-lipped

There is no accessible public roll of the knights of the order. [...] At this moment any stiff-lipped impostor may enter the jeweller's shop at the corner of Essex-street and the Strand, furnish himself with an imitation cross, and parade his counterfeit hero-certificate with impunity.

Source: wiktionary

Again, in art, who holds the scales of notice for the Academy and the Grosvenor, and such like exhibitions? [...] a stiff-lipped, white-faced man, no longer young, whose creed is that no good pictures were painted in the English school before 1880.

Source: wiktionary

Stiff-lipped, stiff-haired, the father gave his orders to the man in red.

Source: wiktionary

Twyla watched it all with the stiff-lipped shock he recalled seeing on patients when he had done his emergency medicine rotation. "Don't tell me," Rob said to her. "Let me guess. Your ex-husband."

Source: wiktionary