不可逆

irreversible

no; not so / (bound form) not; un-

can / may / able to / to approve / to permit / to suit / (particle used for emphasis) certainly / very

used in 可汗[ke4 han2]

cannot / should not / must not

cannot; should not; must not

contrary / opposite / backwards / to go against / to oppose / to betray / to rebel

reversible / (math.) invertible