The term "incontractible" refers to something that cannot be constrained, limited or restricted. In this context, its antonyms would be words that suggest the opposite connotations, such as controllable, manageable or predictable. For instance, a manageable situation is one that can be easily handled, whereas an incontractible situation is difficult to handle or control. Similarly, a predictable outcome is one that can be foreseen, whereas an incontractible outcome is unpredictable, uncertain and volatile. In summary, the antonyms for "incontractible" are flexible, controllable, predictable, manageable, and restrained. These words suggest a level of order, stability, and control over things that are in flux.