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So when you're at the airport or somewhere else, we need to put our fingers and make the fingerprint scanners recognize ours.

But my fingerprint is too adjective, and the fingerprint scanner won't recognize mine. I always experience this situation whenever I have to use these fingerprint scanners.

Someone has a fingerprint that is very clear(or strong, evident? I don't know what adjective I should use here either), so the scanner works very well. But mine is very vague/invisible/blurred or whatever...(I don't think any of these adjectives fits here.) so I have to retry over and over till it can finally read mine.

What adjective can I use in this situation? My fingerprint is sth.

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The most appropriate words that are the opposite of strong/clear are

faint: not strong or clear; slight

blurred: difficult to see

indistinct: not clear

In principle, you could also use unclear, but in my opinion the word is mainly used about something that is not obvious, difficult to understand or uncertain. If you look at the examples in the Cambridge Dictionary and the Oxford Dictionary you will see that this is largely true.

The main problem with fingerprint reading, though, is that the reader relies on a certain amount of moisture in your skin to detect the ridges of your fingerprint. If your fingers are very dry one day and very moist the next, the detected fingerprint will differ from day to day. The best word to describe this is:

inconsistent If a reason, idea, opinion, etc. is inconsistent, different parts of it do not agree, or it does not agree with something else

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  • or "unclear" is a simple opposite of clear
    – James K
    Mar 1, 2018 at 3:59
  • @JamesK, I have updated my answer.
    – JavaLatte
    Mar 1, 2018 at 5:55
  • Thanks a lot! So you're saying it is best to say "my fingerprint is inconsistent", right?" But if my fingerprint is actually more indistinct than other people, (cause the scanners always don't read mine) then can I say my fingerprint is more indistinct/blurred than others'?
    – dbwlsld
    Mar 2, 2018 at 3:29
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    @dbwlsld: You could say that your fingerprint is more inconsistent, or less consistent. You could also use more indistinct. There is actually an adjective blurry, so you can also say blurrier. en.oxforddictionaries.com/definition/blurry
    – JavaLatte
    Mar 2, 2018 at 7:22

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