Time to learn a new word: fizzle.
“Either this was a deceit using a few hundred tons of chemical high explosives or it was a nuclear device that did not go as intended,” said Bob Puerifoy, a former Sandia National Laboratories weapons executive. “I won’t call it a dud — a few hundred tons of explosives is not a dud — but a fizzle. And the designer probably has been shot by now.”