IPA: /ˌʌn.dɪsˈtɔː.tɪd/
KK: /ʌnˈdɪstɔrtɪd/
Not changed or altered in a way that makes it less accurate or clear.
The image was undistorted, showing all the details perfectly.
Undistorted → It is formed from "un-" (meaning not) and "distort" (from Latin "distortus", meaning twisted or turned out of shape). The word "undistorted" means not twisted or altered from its original form.
Think of 'not' ('un-') being added to 'twisted' ('distort') — so undistorted means something that remains in its original, unaltered shape.