From internal + -ly.

• (RP) IPA: /ɪnˈtɜːnəli/, /-ˈtɜːnl̩i/
• (America, Canada) IPA: /ɪnˈtɜɹnəli/
• (Australia) IPA: /ɪnˈtɜːnəli/

internally

1. In an internal manner; within or inside of external limits; in an inner part or situation.

   Synonyms: interiorly

2. With regard to internal affairs.
3. Inwardly; spiritually.
   • 1838 (date written), L[etitia] E[lizabeth] L[andon], chapter XXI, in Lady Anne Granard; or, Keeping up Appearances. […], volume I, London: Henry Colburn, […], published 1842, →OCLC ↗, page 264 ↗:

     "I cannot," said she, internally, "see that it makes any difference to him which of my daughters he takes, if, as he says, it is my admirable mode of bringing them up which has put matrimony into his head, for it is certain I have brought them up impartially...

• inly, insidely

• externally

• Spanish: internamente, interiormente

• Spanish: internamente