The Hebrew and Greek that is translated as “adultery” in English (here etymologically meaning “to alter”) is typically understood as “marital infidelity.” It is (back-) translated in the following ways:
Toraja-Sa’dan: “to measure the depth of the river of (another’s) marriage”
North Alaskan Inupiatun: “married people using what is not theirs” (compare “fornication” which is “unmarried people using what is not theirs”) (source for this and all above: Bratcher / Nida)
The Greek that is translated with “moved with compassion (or: pity)” in English is translated as “to see someone with sorrow” in Piro, “to suffer with someone” in Huastec, or “one’s mind to be as it were out of one” in Balinese (source: Bratcher / Nida).
The English translation by Michael Pakaluk (2019) uses “was keenly affected” in Mark 1:41.
The Hebrew and Greek that is translated as “adulterer” in English would imply “I only take unmarried girls” in Telugu, so it was necessary to be more generic and say “I go after other women” (source: David Clark).
In Central Subanen an “adulterer” is “one who can’t be trusted” (source: Bratcher / Nida) and in Yagaria as “woman-theft man” (source: Renck 1990, p. 139)
The Greek in Mark 6:51 that is translated as “astonished” in many English version is translated for this verse as “their spirits went straight” (implying the kind of astonishment which accompanies emotional relief) into Tzeltal.
The Greek that is translated into English as “vain” or “in vain” in English is (back-) translated in various ways:
Guhu-Samane: “with the front teeth of their mouths they worship me” (“‘In vain’ caused puzzlement [because] why should their efforts to worship God produce no results, try as they may? [But the idiom] ‘with the front teeth of their mouths they worship me’ comes from the picture of one who is making a pretense at eating food, hence their deceit is apparent.’ Source: Ernest L. Richert in Notes on Translation December 1963: p. 4-7; reprinted in The Bible Translator 1965, p. 198ff. )