If you leave corn kernels out for too long, some will be unpoppable.
Source: wiktionary
Unpoppable
Synonyms for "unpoppable"
Ranked by relevance and common usage.
Sample sentences
2 total sentences available.
Even at Hattie's birthday in the chapel, when we'd all shown each other our most freakish body parts, Berry had not had so much as a zit. Now she had a monster pimple, big as a raisin, categorically unpoppable […]
Source: wiktionary