let oneself in for (verb) volunteer: offer to do something
Sinonime: accidental, avoidable,
fortuitous,
futile,
inappropriate, inessential,
needless, nonessential, not required, optional, unessential, uninvited, unneeded, unrequired, unwanted,
unwarranted, unwelcome,
uselessAntonime: compel,
force, obligate