Question

make a word that means \without a reason.\

Explanation:

To form a word meaning "without a reason", we analyze the root "purpose" (relating to reason/intention) and the suffix "less" (meaning without). Combining "purpose" and "less" gives "purposeless", which means without purpose or reason. The suffix "ly" is for adverbs (e.g., quickly) and doesn't fit here as we need an adjective (or a word) meaning without reason.

Answer:

purposeless