IPA: /ˌʌn.dɪˈtɜːrd/
KK: /ʌnˈdɪtɜrd/
Not discouraged or stopped by difficulties or obstacles; continuing to pursue a goal despite challenges.
She remained undeterred by the setbacks and continued to work hard towards her dreams.
Undeterred → It is formed from "un-" (meaning not) and "deter" (from Latin "deterrere", meaning to frighten away). The word "undeterred" means not frightened away or discouraged from pursuing something.
Think of being 'not' ('un-') 'frightened away' ('deter') — that's why undeterred means you keep going despite challenges.