indefectible
/ˌɪndɪˈfɛktəbəl/
adjective
- Not capable of failing, ending, or having flaws; perfect and lasting forever.
- The scientist dreamed of creating an indefectible machine that would never break down.
- Her indefectible loyalty to her friends never wavered, even in hard times.
- The ancient temple was seen as an indefectible symbol of the community's faith.