Also means
mad
Usage Note
toll is a hugely common colloquial way to say something is fantastic, much like English 'cool' or 'awesome'. Its older literal sense is 'mad, raving', preserved in Tollwut ('rabies', literally 'mad-rage') and tollkühn ('foolhardy').
Examples
"Das ist eine tolle Idee."
Natural Translation
That's a great idea.

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