Learn English – What word would you use to describe a situation where words are not necessary

I think a common phrase that sums this point is All work and no play makes Jack a dull boy.

Maybe the word you're looking for is irony.

While they waited for the waitress to bring their coffee, Cheryl suddenly realized it was in this very Starbucks where she and Andy had first met for coffee on that misty day in March six years earlier. How ironic, she thought.