subject to

1 determined by something else your extra piano lesson on Tuesdays is subject to the availability of the music room Synonyms conditional, contingent (on or upon), dependent (to), tentativeRelated Words liable, open, susceptible; limited, modified, qualified, restricted; debatable, disputable, doubtable, doubtful, iffy, problematic (also problematical), questionable, shady, shaky, suspect, uncertainNear Antonyms absolute, all-out, arrant, categorical (also categoric), complete, consummate, out-and-out, outright, perfect, simple, total, ultimate, unadulterated, unalloyed, unconditional, unequivocal, unmitigated, unqualified, utter; basal, basic, fundamental, primaryAntonyms independent, unconditional

2 being in a situation where one is likely to meet with harm this type of wound is highly subject to infection Synonyms endangered, exposed, open, sensitive, liable (to), susceptible, vulnerableRelated Words likely, prone; uncovered, undefended, unguarded, unprotected, unscreened, unsecuredNear Antonyms covered, guarded, protected, safeguarded, screened, secured, sheltered, shielded, wardedAntonyms insusceptible, invulnerable, unexposed, unsusceptible