One of the mysteries of the English language finally explained.
Synonyms of internal in English:
internal
See definition of internal
adjective
1‘the offices faced each other across a large internal courtyard’
SYNONYMS
inner, interior, inside, intramural
central, middle
ANTONYMS
external
2‘she died of internal injuries’
SYNONYMS
inside, inner
within the body, inside the body
ANTONYMS
external
3‘the provinces retain autonomy in their internal affairs’
SYNONYMS
domestic, home, interior, civil, local
national, state
in-house, in-company
ANTONYMS
foreign
4‘she was waging an internal battle with herself’
SYNONYMS
mental, psychological, emotional
personal, private, secret, hidden, intimate