かねない
(Kane nai)
might / could (something bad).
Connection rules
- +V ます-stem + かねない (polite: かねません).
- +Negative prediction — typically expresses concern about an undesirable possibility.
- +Contrast with 〜かもしれない (neutral 'might').
Examples
1.
そんなに無理すると、病気になりかねない。

Sonnani muri suru to, byouki ni nari kane nai.
If you push yourself that hard, you might get sick.
「might / could (something bad)」
2.
彼ならやりかねない。

Kare nara yari kane nai.
Knowing him, he might do it.
「might / could (something bad)」
Practice
If the security is this weak, a serious accident might occur.
これほど警備が薄いと、重大な事故が___。
Romaji also accepted