不到

not to arrive / not reaching / insufficient / less than

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

to (a place) / until (a time) / up to / to go / to arrive / (verb complement denoting completion or result of an action)

to reach; to arrive / to leave for; to go to / to (a place); until (a time); up to (a point) / (verb complement indicating arriving at a place or reaching a point) / considerate; thoughtful; thorough

unexpected / hard to imagine / it had not occurred to me / who could have thought that

cannot get / cannot obtain

lit. not to stop until one reaches the Yellow River (idiom) / fig. to persevere until one reaches one's goal / to keep going while some hope is left

Don't ask and you won't be told any lies. (idiom)

just as bad / not much better

impossible

sour grapes (set expr. based on Aesop) / lit. to say grapes are sour when you can't eat them

can't hear

impossible / can't be done / no can do / unable to accomplish

don't act until the time is ripe (idiom)

lit. until you reach the Great Wall, you're not a proper person; fig. to get over difficulties before reaching the goal