Run-of-the-mill and Straightlaced

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

Straightlaced and run-of-the-mill are semantically related In some cases you can replace term "Straightlaced" with "Run-of-the-mill", this terms are similar.

Straightlaced adjective - Exaggeratedly proper.

Run-of-the-mill and straightlaced are semantically related in unoriginal topic. Sometimes you can use "Run-of-the-mill" instead an adjective "Straightlaced".