What is the answer to "Requiring great effort" in the WSJ Crossword?

The answer to the WSJ Crossword clue "Requiring great effort" is HERCULEAN (9 letters).

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WSJ

Requiring great effort WSJ Crossword Clue

Down clue · from the June 6, 2026 puzzle

Stuck on “Requiring great effort” from the Wall Street Journal Crossword? Here is the verified answer:

Answer

HERCULEAN

9 letters · Down · last seen June 6, 2026

1DSome stadium merch4 1ATrek to the Kaaba4 2DHeaps4 3DLike a killjoy4 4DBirds originally appeared during it8 5AUp to now5 5D“Not another word!”6 6DW. Hemisphere alliance3 7DShamelessly plug4 8DPurina brand4 9DSnorkeling sites5 10AFree ones often have ads4