1.
If you say that a comment is ~, you mean that it has two meanings, so that you are not sure whether the person who said it is being critical or is giving praise.
Even his praise is ~.
ADJ
2.
If you say that something is ~, you mean that its positive effects are balanced by its negative effects, or that its negative effects are greater.
But tourism is ~, boosting the economy but damaging the environment...
a ~ sword: see sword
ADJ: usu v-link ADJ