Wiktionary
unbreakably
adv. In a unbreakable manner.
Usage examples of "unbreakably".
The oath was more costly than any gift being burned, for it bound her life unbreakably to Barrayar.
His breath fanned over my face as his voice wrapped me in unbreakably strong silken bonds.
Unless he established his position unbreakably firm before Ottar thought to call Bela, he was trapped.
Then there was all the leather, which brought her out in a rash but seemed to be unbreakably traditional.