Use 'unassuming' to describe someone who avoids showing off, even when they have reasons to. He's an unassuming champion, avoiding any grand celebrations.
Pro Tip 2/3
Positive Nuance
'Unassuming' generally has a positive connotation, suggesting a pleasant modesty. Her unassuming nature made her well-liked by her peers.
Pro Tip 3/3
Cultural Sensitivity
In cultures valuing humility, 'unassuming' is highly regarded and respected. In our community, unassuming individuals are often entrusted with leadership.