https://www.merriam-webster.com/word-of-the-day

spoiler

Furtive

[Word] describes something that is done in a quiet and secret way to avoid being noticed. It can also mean “expressive of stealth” or “sly” (as in “a [Word] look”), or “obtained underhandedly” (as in “[Word] gains”).

Feel free to try your hand at writing it in the comments!