Additionally, there are some words which change their meaning according to context. 'Quite' is an example. "I was quite pleased to meet you" does not mean "very pleased". But the reply "Quite" to the statement " That is a dreadful situation" means "Absolutely so, I agree fully" and "It was quite dreadful" means "it was utterly dreadful", not " it was a bit dreadful", yet "It was quite frightening" does mean "it was a bit frightening".
No wonder foreigners get confused. And one thing beginners find difficult is that we add just word one to a verb and change the meaning : wash up, wash down, wash over; pull up, pull down, pull over etc