Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
French
abstrus
←
Latin
abstrusus
(mention)
←
Latin
abstrudo
(mention)
→
English
abstruse
(borrowed)
→
Romanian
abstrus
(borrowed)