Oliver Davis——Works at the International Maritime Organization, Lives in London, UK.
Quick is an adjective describing thinker, so no -ly is attached. She thinks fast/fastly. Fast answers the question how, so it is an adverb. But fast never has -ly attached to it. We performed bad/badly.read more >>
QuesHub is a place where questions meet answers, it is more authentic than Quora, but you still need to discern the answers provided by the respondents.