The canonical use of -ish is as a suffix meaning “approximately,” as in bluish, tallish, sixish, or even hungry-ish. This is the definition—the only definition—that you’ll find in Merriam-Webster, ...

Prefixes and suffixes are additions to words that change them into different words. Prefixes are added to the beginning and suffixes are added to the end of the word. Examples of a prefix include ‘Pre ...