opportunity - n. an amount of time or a situation in which something can be done: a chance

approach - n. a way of dealing with something: a way of doing or thinking about something

uncertainty - n. something that is doubtful or unknown: something that is uncertain — usually plural

contradict - v. to say the opposite of (something that someone else has said) : to deny the truth of (something)

inalienable - adj. impossible to take away or give up