What is the synonym of 'bold'?

The synonym of 'bold' is courageous.

Bold:
English meaning: showing a willingness to take risks; confident and courageous.
Bangla meaning: সাহসী, সাহসিক।
Example: The entrepreneur made a bold decision to invest all her savings into her startup.

Courageous:
English meaning: not deterred by danger or pain; brave.
Bangla meaning: বীর, সাহসী।
Example: The soldier's courageous act saved his comrades during the enemy ambush.

In addition,

Timid:
English meaning: showing a lack of courage or confidence; easily frightened.
Bangla meaning: ভীরু।
Example: The timid puppy cowered in fear at the sight of strangers.

Reserved:
English meaning: slow to reveal emotion or opinions; restrained or quiet.
Bangla meaning: সাবধান, সংযত।
Example: Despite her knowledge on the subject, she remained reserved during the heated debate.

Hesitant:
English meaning: tentative, unsure, or slow in acting or speaking.
Bangla meaning: দ্বিধাগ্রস্থ।
Example: He was hesitant to confront his boss about the unfair treatment he received.

Source: Cambridge dictionary