accidental

"The time of Henry VII nearly coincides with the commencement of what is termed modern history."

"Proper punctuation, like commas and periods, makes our writing clearer and easier to understand. "

"He discovered penicillin largely accidentally."

"During the lockdown, stores selling nonessentials were closed. "

"My unintentional comment hurt her feelings. "

"It was a fortuitous meeting that led to John getting a job offer. "

"The brightness of the classroom light made it easy to see the teacher's notes. "

"The weather changed dramatically; it was sunny one moment and raining heavily the next. "

"The intersection of Maple Street and Oak Avenue is always congested during rush hour. "

"The correct capitalization of names in the school essay is essential for a good grade. "

"The math problem required us to understand the dimensional relationships of the cube. "

"The meeting ended unexpectedly early, leaving us with extra time before dinner. "