The lecture was not interesting at all; it was mind-numbing.
- have an open mind about (something)
- put one's mind to (something)
- come to mind
- read (someone's) mind
- mind is buzzing
- make up one's mind
- mind one's P's and Q's
- last thing on (someone's) mind
- stick in (someone's) mind
- keep (someone or something) in mind
- have a one-track mind
- Out of sight, out of mind.
- have a mind like a steel trap
- in a positive frame of mind