Do something in a shy, self-effacing way, and you're doing it meekly. While some students argue with a teacher over a bad grade, others simply accept it meekly.
Aggressive dogs growl menacingly at strangers, but submissive dogs bow their heads and meekly wag their tails. If you're very reserved, you might find it hard to speak up for yourself, tending instead to listen meekly to what others say without offering your own opinion. The adverb meekly, along with the related adjective meek, has a Scandinavian root — it's related to the Old Norse mjukr, "soft and pliant."