Adverb lathra (secretly) in the Bible

(Translation from NRSV for the New Testament and Brenton for the Septuagint with a few modifications for a more literal meaning)

Matthew

1: 19Her husband Joseph, being a righteous man and unwilling to expose her to public disgrace, planned to dismiss her secretly (lathra).
2: 7Then Herod secretly (lathra) called for the wise men and learned from them the exact time when the star had appeared.

John

11: 28When she had said this, she went back and called her sister Mary, and told her secretly (lathra), "The Teacher is here and is calling for you."

Acts

16: 37But Paul replied, "They have beaten us in public, uncondemned, men who are Roman citizens, and have thrown us into prison; and now are they going to discharge us secretly (lathra)? Certainly not! Let them come and take us out themselves."

Deuteronomy (LXX)

13: 7And if thy brother by thy father or mother, or thy son, or daughter, or thy wife in thy bosom, or friend who is equal to thine own soul, entreat thee secretly (lathra), saying, Let us go and serve other gods, which neither thou nor thy fathers have known,

1 Samuel (LXX: 1 Kings)

18: 22And Saul charged his servants, saying, Speak ye secretly (lathra) to David, saying, Behold, the king delights in thee, and all his servants love thee, and do thou become the king's son-in-law.
26: 5And David arose secretly (lathra), and goes into the place where Saul was sleeping, and there was Abenner the son of Ner, the captain of his host: and Saul was sleeping in a chariot, and the people had encamped round about him.

Habakkuk (LXX)

3: 14Thou didst cut asunder the heads of princes with amazement, they shall tremble in it; they shall burst their bridles, they shall be as a poor man devouring secretly (lathra).

Job (LXX)

31: 27and if my heart was secretly (lathra) deceived, and if I have laid my hand upon my mouth and kissed it:

Psalms (LXX)

101 (100): 5Him that secretly (lathra) speaks against his neighbour, him have I driven from me: he that is proud in look and insatiable in heart, with him I have not eaten.

1 Maccabees (LXX)

9: 60Then removed he, and came with a great host, and sent letters secretly (lathra) to his adherents in Judea, that they should take Jonathan and those that were with him: howbeit they could not, because their counsel was known unto them.

3 Maccabees (LXX)

6: 24Ye have governed badly; and have exceeded tyrants in cruelty; and me your benefactor ye have laboured to deprive at once of my dominion and my life, by secretly (lathra) devising measures injurious to the kingdom.