The adverb “modestly” means in a way that shows humility, restraint, or moderation. Some synonyms for “modestly” are “humbly”, “unassumingly”, “reservedly”, and “moderately”.
“Humbly” emphasizes a sense of meekness and lack of arrogance. For example, “She accepted the award humbly.” This shows that she was very modest and didn’t boast about her achievement.
“Unassumingly” suggests a lack of pretension or self-importance. “He walked into the room unassumingly.” Here, the person enters without drawing attention to himself or acting superior.
“Reservedly” implies a degree of restraint or caution. “She spoke reservedly about her plans.” This indicates that she was not overly eager to share her plans and was somewhat guarded in her conversation.
“Moderately” can mean in a moderate or restrained way. “He spent moderately on his vacation.” This shows that he didn’t overspend and was reasonable in his expenditures.