DECENTLY.1Co_14:40, Let all things be done decently and in order, that is, in a comely, handsome manner; for that is the old meaning of decent, and it is the meaning of the Gr. word used.
Hastings' Dictionary of the Bible
Edited by James Hastings, D.D. Published in 1909
dē?sent-li (εὐσχημόνως, euschēmónōs): Only once is this word found in our English Bible (1Co_14:40). It is in the last verse of that remarkable chapter on the proper use of spiritual gifts in the church and the proper conduct of public worship. It does not refer here to absence of impurity or obscenity. It rather refers to good order in the conduct of public worship. All things that are done and said in public worship are to be in harmony with that becoming and reverent spirit and tone that befit the true worshippers of God.
International Standard Bible Encyclopedia
PRINTER 1915.