There are two Greek words in the New Testament translated "devout." One is "eulabes" which literally means, "taking hold well." It carries a meaning in the New Testament of careful as to the realization of the presence and claims of God. We can see this meaning in Simeon in Luke 2:25, "And, behold, there was a man in Jerusalem, whose name was Simeon; and the same man was just and devout, waiting for the consolation of Israel: and the Holy Ghost was upon him." Remember, this was the old man who, when he saw the baby Jesus said, "Lord, now lettest thou thy servant depart in peace, according to thy word: For mine eyes have seen thy salvation, Which thou hast prepared before the face of all people; A light to lighten the Gentiles, and the glory of thy people Israel" Simeon was a devout man in that he believed God and was obedient to Him and he was blessed to see the Messiah.
The other word is "eusebes" which literally means, "reverence well." It directs us to the energy which is directed by holy awe of God and finds expression in devoted activity. This word is used to describe Cornelius the Gentile in Acts 10:2, "A devout man, and one that feared God with all his house, which gave much alms to the people, and prayed to God alway." Cornelius showed that he was a devout man by the actions that he took in giving much alms to the people and in his prayer life. Are you a devout person?