very difficult; after going through a lot of trouble

to be duty-bound or morally obligated to act; to be something that one cannot shirk without dishonor

to brook no delay; to demand immediate action without a second's delay

unquestionable; beyond doubt; so true or certain that it does not allow for any skepticism

Literally "fire and water cannot coexist"; used to describe two people or groups who are mutually exclusive or fundamentally opposed.

unpardonable by the laws of nature; describing a person or action that is so wicked, cruel, or contrary to morality that it is beyond forgiveness or divine tolerance

extremely critical or precarious situation where not even a single hair can be inserted between things

To allow no explanation or room for argument; to act without letting someone explain themselves.

Describes a person or a crime that is so heinous and wicked that neither heaven nor earth can tolerate it

describes a crime so heinous that even executing the offender would not be enough to atone for it; guilty of most atrocious crimes

indisputable; not to be denied; not brooking any argument

not to allow others to put in a word; to permit no interruption or criticism

In the blink of an eye; used to describe a situation that is extremely urgent or time that is so tight it does not allow for a single breath of breath of delay

difficult; not simple to do or achieve

Literally "one mountain cannot hold two tigers"; used to describe two equally powerful rivals who cannot coexist in the same place.