An indefinite adjective tells you some information about a noun without being exact in its description. Common indefinite adjectives are the words ‘many’, ‘few’, ‘all’ and ‘some’. ‘Many’ means quite a few, but doesn’t tell you exactly how many. ‘All’ tells you every single one, but once again doesn’t tell you exactly how many this is. Here is an example of an indefinite adjective being used:
You can go on ahead, I’ll just be a few more minutes.