"Constraintive" is an uncommon adjective that means restrictive or limiting. Its antonyms are words that convey opposite meanings. Some antonyms of "constraintive" are liberating, enabling, freeing, and empowering. If something is liberating, it is not limiting or restrictive. Similarly, if something is enabling, it allows one to operate at their full capacity without restrictions. On the other hand, if something is freeing, it encourages one to be creative and innovative. Lastly, if something is empowering, it makes one feel capable, confident, and in control. All these antonyms of "constraintive" describe a condition that is open, free, and unencumbered rather than one that is limited or restricted.