IPA: /ˈdɪfɪdənt/
KK: /ˈdɪfɪdənt/
Someone who is shy and lacks confidence in themselves, often feeling unsure about their abilities or opinions.
Despite her talent, she remained diffident during the presentation, hardly speaking up.
Diffident → It is formed from "dis-" (meaning apart or away) and "fidere" (meaning to trust or have faith). The word describes a state of being lacking in self-confidence or trust in oneself, hence feeling apart from confidence.
Think of someone who feels 'apart' ('dis-') from 'trust' ('fidere') in themselves — that's why diffident means lacking self-confidence.