IPA: /ʌnˈdriːmpt/
KK: /ʌnˈdrɛmpt/
Something that has not been imagined or thought about before.
The artist created a world of undreamt possibilities in her paintings.
Undreamt → It is formed from "un-" (meaning not) and "dreamt" (the past tense of "dream", which comes from Old English "drēam", meaning a joyful noise or music). The word "undreamt" means not dreamed or not imagined, often referring to something that has not been conceived or thought of.
Think of 'not' ('un-') and something that has not been 'imagined' ('dreamt'). This helps you remember that 'undreamt' refers to things that have not been thought of or envisioned.