Final answer:
The nearest synonym for the word 'diffident' is 'shy'.
Step-by-step explanation:
The nearest synonym for the word 'diffident' is shy.
Someone who is diffident tends to be lacking in confidence and is hesitant or timid in their behavior.
Similarly, someone who is shy also lacks confidence and tends to be reserved or introverted in social situations.
For example, a diffident person might feel nervous about speaking in public, while a shy person might also avoid social gatherings or feel uncomfortable in large groups.