Tight-assed

Assemblyperson Baker, as she probably liked to be addressed, had all the lyricism and sensuality of Betty Crocker. She was so tight-assed that she even wore stockings in the tropics.

Source: wiktionary

This noncritical atmosphere works for us because the three of us are so tight assed about revealing our emotions.

Source: wiktionary

A group of pedestrians waited on the corner opposite for the lights to change even though there was no traffic coming in either direction. After watching them for a while Hoffmann muttered savagely, ‘The goddam tight-assed Swiss...’

Source: wiktionary

[…] Gottlieb obviously wishes, above all else in life, that he could turn himself into that miserable don and learn to write his spiteful-playful tight-assed vinegar prose.

Source: wiktionary