The phrase "a serious night" is correct and usable in written English.
It can be used to describe a night that is significant, solemn, or marked by important events or discussions.
Example: "After the meeting, we all knew it was going to be a serious night filled with tough decisions."
Alternatives: "a solemn evening" or "a significant night".
· Last word from the Lib Dem dictionary: A Razzell (noun): a serious night out.
He was very nervous when faced with a bunch of ordinary farmers clearly intent on having a serious night out.
After the game, A. J. Burnett crept behind Swisher with a shaving-cream pie as another Sinatra song, "New York, New York," washed over the fans as they left the stadium that Steinbrenner built, a serious night turned joyful.
Phelps picked up six last time around in Athens and, at this rate, will end up with more gold around his neck than P Diddy on a serious night out.
Some possible causes of serious night sweats include acute or chronic infections, lymphoma and other tumors, low blood sugar in patients with diabetes, and some medications.
Here it's also cited as a "little piece of San Francisco modern dot-com history, thanks to its owner, Jamie Zawinski," who contributed to Netscape and Mozilla before he "turned to serious night play".
Unless you're plagued with serious night terrors, waking up is one of the hardest parts of the day.
Magic weapons that blow flying things out of the air sounds like some serious Night King shit, but apparently even "drone killers" weren't enough to clamp down on the slow leak of spoilers.
"In the last few years this has really become a serious issue with New York night life," he said, referring to his neighbors' antipathy.
Newton was a serious alchemist, who spent night upon dawn for three decades of his life slaving over a stygian furnace in search of the power to transmute one chemical element into another.
Brazil "…caught a serious case of Saturday Night Fever," Johnson and Stam wrote, "to the extent that the supple Brazilian language sprouted neologistic verbs and nouns from the root 'Travolta' — travoltar (to travolt), travoltice (travoltage)," to describe things influenced by the film's disco-era flair.
