Inter-mutual means reciprocal or mutual. Therefore, antonyms for inter-mutual are words that convey the opposite meaning, such as one-way, unreciprocated or non-mutual. Inter-mutual communication refers to the exchange of information between two or more parties, where each receives or gives information equally. The opposite of inter-mutual communication is one-way communication or communication that only flows in one direction. Inter-mutual cooperation implies collaboration or teamwork, where everyone contributes equally. The opposite of inter-mutual cooperation would be competition. In conclusion, the antonyms of inter-mutual are words that signify the absence of mutual or reciprocal action, such as one-way, unreciprocated or non-mutual.