Where does “thực lòng” come from?

thực lòng (Vietnamese) comes from Vietnamese lòng, from Latin longus, from Latin -ē, from Latin dis-, from Latin calceus, from Latin calx, from Ancient Greek χάλιξ — small stone, pebble; gravel, rubble.

Ancestry of “thực lòng”, step by step

thực lòng traces back through two separate lines of ancestry.

via Vietnamese lòng

StepLanguageWordMeaning
1Vietnameselòngintestines; the central region of a hand or foot;...
2Latinlongusfar, long; extended, prolonged; long; tedious,...
3Latinly; used to form adverbs from adjectives
4Latindis-asunder, apart, in two; reversal, removal;...
5Latincalceusshoe
6Latincalxlimestone; chalk; the finish line
7Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via Vietnamese thực

StepLanguageWordMeaning
1Vietnamesethựctrue, real; food
2Chinese
Every word from Ancient Greek χάλιξEvery word from Latin dis-Every word from Latin