Even if I provide focused seeds to Google Keyword Planner, it usually returns some irrelevant keywords.
I want to quickly detect and remove them. Do I have to check every suggested keyword? Sometimes it's really time consuming?
Are you familiar with the Keyword Planner's filter options?
The filtering feature, provides 2 options for you:
Negative Keywords: As you scroll through the generated Keywords, simply enter any Keywords you do not want to appear, within the 'Negative Keyword' list. In doing so, it will remove any Keywords, which contain the Negative Keyword, from the list.
Keyword Text: If you select the Filter option, you will see a Pop up box, as follows:
You can simply enter a word or phrase you want to only appear in the generated list of Keyword. For example, your list may contain:
If you only want Keywords to contain 'Apples', then the list will filter, to only show:
Is this what you mean?