If something is "uncontrolled," it means it is not under control now. If something is "uncontrollable," it means that it cannot be controlled. -able is a very common suffix. For instance: This heat is unbearable (I cannot bear it). His actions are indescribable (I cannot describe them). All men are endowed by their creator with certain inalienable rights (men cannot alienate, or give away, these rights).

Here are the basic differences between the two words: When something is uncontrolled, it is not under control. An example sentence is, "The uncontrolled child ran around the store stealing candy," When something is uncontrollable, it is not possible to control. An example sentence is, "The tsunami was an uncontrollable disaster." I hope this has helped!