The word "un-controllable" refers to something that cannot be controlled or restrained. Antonyms of this word would be "controllable" or "manageable". Control refers to the ability to regulate or direct something, and the opposite of being out of control is to be in control. Hence, the antonyms of un-controllable would be words like "manageable", "governable", "restrainable", "fixable", "conquerable", and "tameable". These words all suggest that the object or situation can be brought under control or managed in some way. Having control over things means being able to regulate or direct them towards a certain goal or outcome.