im-PUR-vee-us
(adjective) Not allowing something to pass through; unaffected by external influences.
She remained impervious to criticism, focused entirely on her goal.
Fun Fact
Originally used to describe waterproof materials, “impervious” has become metaphorical over time. Now you might hear it in business meetings or therapy sessions to describe emotional resilience.
sur-up-TISH-us
(adjective) Kept secret, especially because it would not be approved of; stealthy or secretive.
She cast a surreptitious glance at her phone during the meeting.
Late Middle English: from Latin “surreptitius,” from “surripere” meaning “to take away secretly,” from “sub-” (secretly) + “rapere” (to seize).
Fun Fact
Surreptitious behavior isn’t necessarily illegal or immoral—it’s just done on the sly because it wouldn’t be approved. Surreptitious glances at your watch during boring presentations, surreptitious snacking before dinner, surreptitious phone checks during conversations—these minor sneaky acts define modern life. The word shares its Latin root with “rapture” through the idea of seizing, though surreptitious seizing happens quietly rather than ecstatically. Spy novels love the word for describing covert operations, but everyday surreptitious acts are far more common than espionage, making it the perfect word for socially awkward secret-keeping.
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