to remain faithful to an agreement

submit to, put up with

(of a person) to wait for (something)

wait with expectation

to hold tightly

attach to

of cling

attach to

to go on (being, doing, something)

persist, carry on

to suffer a long period of (pain, hardship etc)

bear hardship

to make an effort to continue with, do, (especially difficult or tiring)

keep at; work hard

without pity (and determined)

cruel, merciless

to exist (on)

keep going, living