This is the 6600th most frequent Chinese word.
暗暗
Secretly; quietly; inwardly.
The word '暗暗' here means 'secretly' or 'internally', describing an action or thought done without revealing to others.
他暗暗下了决定，要努力学习。
He secretly made a decision to study hard.
Here, '暗暗' implies the act of observing stealthily or without drawing attention.
她暗暗观察周围的情况，以便采取行动。
She secretly observed the surroundings to take action.
In this sentence, '暗暗' highlights his internal feeling that he kept to himself.