Childishly simple
THE ANSWER IS
The answer is ELEMENTARY.
Tap reveal when you’re ready—the letters stay hidden until then.
Why it fits
ELEMENTARY is the 10-letter answer to “Childishly simple” in the December 10, 2021 Lexigo puzzle. Every answer must also trace a connected path across touching hexagons, with each word linking to its neighbors in the chain—so ELEMENTARY both satisfies the clue and fits the day’s board.