Here's the question corrected: ============ I thought these two words basically had the same meaning. But I don't know when these words are used differently in sentences. -> btw is this sentence correct? :( ============ Enough is used to describe when a quantity / number of something has reached a threshold that allows something else to be true.. "Do I have enough gasoline / petrol to get where I"m going?" <-- OK Adequate is used to describe when the quality of something is good enough for some standard. "Is this dress adequate for my school's formal dance this year?" <-- OK Sometimes they are interchangeable, but if you're talking about something that can be quantified, usually you'll used "enough", and when you're talking about some less numerical quality, you're more likely to use "adequate".