Run-of-the-mill and Straight-laced

Run-of-the-mill adjective - Being of the type that is encountered in the normal course of events.

Straight-laced and run-of-the-mill are semantically related In some cases you can use "Straight-laced" instead an adjective phrase "Run-of-the-mill".

Straight-laced adjective - Exaggeratedly proper.

Run-of-the-mill and straight-laced are semantically related in unoriginal topic. Sometimes you can use "Run-of-the-mill" instead an adjective phrase "Straight-laced".