Short YouTube tutorial (transcript) teaching how to pronounce the adjective 'subtle'. Two speakers demonstrate the phonetics (noting the silent 'b', the reduced vowel /ə/ as 'suh', and similarity to the end of 'bottle'), give a one-line meaning (not obvious; easy to miss; delicate), and provide two brief example sentences illustrating usage.
Subtle. Subtle. Subtle. There is no B and the T.
Sounds like a.
Very short D. Listen. Suh.
Like sun.
Suh. And then we have dull. So subtle means.
Something that is not obvious or noticeable right away. It's usually something very small.