Noun
empty threat (plural empty threats)
A threat made with no chance of being carried out.
Synonym: (archaic) brutum fulmen
And it can’t be an empty threat, either. Source: Internet
Fortunately, it was an empty threat, as the legal mechanisms require one year written notice and a commitment of three years before withdrawal, by which time a US re-election would already be in place. Source: Internet
Do you think this is a reasonable concern or more of an empty threat? Source: Internet
“With all due respect, I think it’s an empty threat and it’s a little ridiculous.” Source: Internet