Random spell check error. How it got to "nimble" I have no idea.
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I tried to write "bumble", and was going to post some pictures. But then it posted as "nimble" and I laughed a lot.
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Apple is very good about spell-guessing. Not spell-checking. They know the little iPhone keys are small and next to other ones, so some of their "corrections" assume you hit the key next to the one you want.
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So I typed "bumble", and it assumed I hit an b instead of a n, then a u instead of an i (both "mistakes" just to the left of the "correct" letter) and fixed my word.
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I often appreciate iPhones spell fixes. And sometimes they make me laugh.