ค้างคาใจ(káang kaa jai)

Meanings

1AdjectiveB2

unresolved in mind; weighing on one’s mind

Unresolved in one’s mind and causing unease or nagging worry.

Examples

The argument with my mom still nags at me, keeping me up all night.
2VerbB2

[to] weigh on [sb]’s mind

To remain unresolved and keep nagging or bothering [sb]’s mind.