The word "in suppressible" refers to something that cannot be suppressed or restrained. Its antonyms include "controllable," "manageable," "restrainable," and "suppressible." These words suggest that the object or situation in question can be controlled or restrained in some way.
For example, an outbreak of a contagious disease may be considered "in suppressible" if it has spread too far and cannot be contained. However, if measures are taken to control the spread, such as quarantine or vaccination, the outbreak may become "manageable" or "suppressible."
Similarly, emotions that are "in suppressible" may feel overwhelming and uncontrollable. But with mindfulness or therapy, such emotions may become more "restrainable" or "controllable" over time.