Longman Dictionary of Contemporary English
The Collaborative International Dictionary
innumerate \innumerate\ adj. Lacking knowledge and understanding of mathematical concepts and methods; by analogy with illiterate. Opposite of numerate. Also See: educated; illiterate.
Wiktionary
a. Lacking numeracy. n. One who lacks numeracy skills.
WordNet
adj. lacking knowledge and understanding of mathematical concepts and methods [ant: numerate]
Usage examples of "innumerate".
Time and again, by everyone from the mainly innumerate desert-dwelling Thyre to a highly sophisticated Earth mathematician.
Educating myself to the point where I'd be capable of intelligently and ethically managing or investing that much money would take years of distasteful skullsweat for which I am spectacularly ill suited: I'm just this side of innumerate, and I gave up trying to do my own taxes when I was twenty years old.
It was truly a remarkable accomplishment, Quark thought, teaching these innumerate barbarians the principles of capitalism in just one hour.