Perfunctory is one of those words I learned as a teenager and find a use for maybe once or twice a year. It’s an adjective meaning “done out of duty or routine; done cursorily or mechanically, without care, interest, or enthusiasm”:
Cycling by at speed, she offered a perfunctory wave.
The spectators were distracted, their applause perfunctory.
The doorman smiled perfunctorily as the guests entered.
In the foyer she read a perfunctory summary of the emergency rules.
For some reason I recently ran a search for perfunctory on Thesaurus.com. Here’s what happened:
And I thought, “How did you know!?”
It seems to be working now, but at the time I was quite taken aback by the paradox. Luckily it was just a perfunctory search.