to make legally invalid or void

very demanding;

difficult to accomplish or achieve

secret;

concealed

the regard in which one is held

(usually high regard)

a person who lives in a foreign country

fortunate; lucky;

happening by a lucky chance

incapable of being satisfied

emotionally unstable; affected with strong feelings of fear or worry

to settle or resolve differences;

to restore friendship

uncertain; not fully worked-out

usefulness;

fitness for some purpose