The phrase "mundane lesson" is correct and usable in written English.
It means a routine or ordinary lesson that is not particularly interesting or exciting. Example: "The teacher droned on about grammar rules in a mundane lesson that left her students struggling to stay awake."
The test produced mundane lessons as well.
But whether it was a world leader, convicted killer or a celebrity that sat across from her, Walters' interviews were eye-opening, sparked controversy, and brought many of her interviewees to tears as she made them reflect on the mundane yet important lessons of life.
They missed 45 minutes of ineffably touching, occasionally sentimental vignettes, music and seemingly mundane yet profound life lessons, culminating in the joyous first movement of Beethoven's Sixth.
Yet many experts inside and outside the process said the final document was not radically different from the previous version, and its lessons more mundane than the rhetoric implied.
They give lessons about mundane and usually private routines — applying mascara and eyeliner, putting on fake eyelashes, plucking eyebrows, blow drying hair or brushing one's cleavage with bronzer to make it look deeper.
He joined children for dodgeball games, sent them holiday cards and managed to turn seemingly mundane topics into interesting lessons.
A master sleuth at spotting flaws in students' swings, he has taken the fairly mundane task of giving golf lessons and turned it into a global business that includes schools, corporate outings, books, videos and teaching aids.
But the lessons may be more mundane, to do with providing them with the right sort of staff and resources.
I just really don't like dealing with the pressure that comes with pretending life is always well-lit and that there's an inspiring lesson to learn from every mundane moment.
The Mundane: Can you drive Dan to tennis lessons today?
