The phrase "an unavoidable one" is correct and usable in written English.
It can be used to describe a situation, event, or decision that cannot be avoided or escaped.
Example: "The consequences of our actions were an unavoidable one, and we had to face them head-on."
Alternatives: "an inescapable one" or "an inevitable one".
Not an angry divide, necessarily, but an unavoidable one; a divide of generations, convictions, conventions and therefore of styles.
Hint that you would rather be at any other place and time when you find yourself in an unavoidable one on one conversation with this person that is holding you down from certain success and happiness.
Not a simple task, but for Twitter an unavoidable one.
Afghanistan is the obvious candidate — maybe an unavoidable one if the Taliban finally will not coöperate.
The absence of any board members with strong ties to the local community was a serious deficit, but an unavoidable one.
That's a legitimate concern, but also a largely unavoidable one if we are to tackle the medium-term fiscal problem.
Crawford's last words—heard over the phone by his girlfriend were "It's not real!" Currently, Crawford's death is being treated as a tragedy by the authorities, but a mostly unavoidable one.
Maybe that's why the US FDA allows for certain amounts of rodent hair in various products, something they call an "unavoidable defects": one rodent hair for every 100g chocolate, 22 rodent hairs for every 100g cinnamon and five rodent hairs for every 18oz jar of peanut butter.
Although IAVI managers thought having the occasional bad match may be unavoidable, one Fellow thought it was important to design a system for early termination of fellowships that don't seem to be working: "There should be a way to terminate the relationship, so as not to waste everyone's time and make others discouraged who hear about the waste".
"Interesting, but unavoidable," one reader posted.
The unavoidable one is that America is more beautiful in more places in so many ways than most Americans will ever know.
