Not exactly. Deflation basically slows down the economy. If you think your money will worth more tomorrow, then you are less likely to invest/spend them.

But the whole purpose of money is to be used. Money is a tool, the oil that facilitates trade and keeps the economy going. And while too much money(oil) can overheat the economy(inflation), too little money can straight up bring the economy to a halt(deflation).

Deflation, even in small amounts, is more dangerous, thats why ideally you prefer having a small amount of inflation.