Monoflexible is an adjective that describes a person who is only interested in monogamous relationships in the present, yet open to exploring polyamorous or other open relationships in the future.
While monoflexible people may seem to be monogamous to others members of society, the people who prefer this adjective feels it is a more accurate description as it considers their level of poly-awareness and interest which is outside the norm.
Monoflexible is often written as mono-flexible.