Also called the fallacy of the beard, line-drawing fallacy, fallacy of the heap, the sorites fallacy, and the bald man fallacy, the continuum fallacy rejects a claim because it is not precise. The is fallacious because, vague, "in-between" or unclear scenarios do not make them necessarily untrue.
Ronnie has a full head of hair. If you pull one out, he will not be bald. If you pull another out, he still will not be bald. So no matter how many hairs you pull out, Ronnie will not be bald.