not up to
see up to.
“Not Good” vs. “No Good”: When To Use Them BothHere’s something that’s good to know: No good means something has no use or value, and has no potential of becoming good. Not good means something is bad or undesirable. The correct way to use them isn’t that clear cut. At times, there’s no difference, and they can be used interchangeably. No Good When good is used as a noun, no can quantify or modify …
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.