Steadfast
WordNet
adjective
(1) Firm and dependable especially in loyalty
"A steadfast ally"
"A staunch defender of free speech"
"Unswerving devotion"
"Unswerving allegiance"
(2) Marked by firm determination or resolution; not shakable
"Firm convictions"
"A firm mouth"
"Steadfast resolve"
"A man of unbendable perseverence"
"Unwavering loyalty"
WiktionaryText
Etymology
From stedefast which in turn comes from stedefæst. It is comprised of two parts: stede (“place”) + fæst (“fixed”).
Adjective
- Fixed or unchanging; steady.
- Firmly loyal or constant; unswerving.