Extremely harmful crossword clue

2 answers. Most likely: CATASTROPHIC (12 letters).

Answers by number of letters

adjective

“extremely harmful; bringing physical or financial ruin”

Example: a catastrophic depression

Answers with this meaning: CATASTROPHIC, RUINOUS

Definition from Open English WordNet (CC BY 4.0).

What is the answer to the “Extremely harmful” crossword clue?

The most likely answer is CATASTROPHIC (12 letters). Other answers: RUINOUS (7).

How many letters are in the answer to “Extremely harmful”?

Answers have 7 or 12 letters. Count the squares in your grid to pick the right one.