The word "blithely" is correct and usable in written English.
It is an adverb which means carefree and unconcerned. Example sentence: The passengers blithely flew to Hawaii without a care in the world.
In WaterAid's second film, football commentators talk blithely about a player being the most likely to score because he's "on day two of his cycle" and "right in the optimum performance zone this month".
One subject blithely said that they assumed the food tasted better because that's what the media kept telling them.
Above all, suspicion remains that HS2 will be, to borrow a phrase from one ex-transport secretary, a rich man's toy: trains sparsely populated by businessmen whizzing blithely through the estates – council and country – of people who will never use it.
The cave walls in this Indigenous protected area were, for generations, effectively artists' blackboards; new paintings would be blithely brushed over others that were thousands of years old, as urgent memories of new stories superseded the ancient.
A government minister, presented with some self-evident fact – benefit sanctions cause people to go hungry – blithely rejects it.
The planners, she says "blithely ignored all local opposition".
Perhaps they're just afraid of what my ability to blithely wear them says about what's supposedly too "girly" for men to do.
"We began to realise that everyone we met was either drunk, flanked by an angry dog or undressed," she blithely wrote.
Charles opened blithely: "It made me wonder if you had heard about an initiative which links hospital catering to local farmers' hubs, bringing benefit to patients (better quality food), the farmers (a reliable and local market) and the environment (lower food miles and less waste)?" He offers to put the secretary of state in touch with the "middleman" providing the quality provisions.
Such a conflicted sense of obesity (blithely guzzling yet guilty and sad) contrasts curiously with Melissa McCarthy's undercutting of fat gags in the new comedy Spy.
He might have added Mexico, had its drugs scandal erupted a little earlier; and, when he did not, the lower house of Congress, happy to do the president's work for him, blithely passed a resolution requiring that the Mexicans too be decertified unless they met sundry tests of anti-drug virtue written by itself.
