expression, i-adjective
likely to do; capable of doing; would not hesitate to do
Expresses a strong possibility that someone might do something, often with a negative or surprising connotation. Used when the speaker thinks the action is plausible and sometimes alarming. The subject is usually a person, and the verb before かねない is in the continuative form (連用形).
See also: しかねない
彼ならやりかねない。
He's quite capable of doing it.
あの人は秘密をばらしかねない。
That person might well spill the secret.
You never know what she'll say when she's angry. She might even do something terrible.