Unshakeable
Definition 1 of 2

Emotion
The word conveys a strong emotional conviction.

His unshakeable love for her shone through in his actions.
Literary
In literature, it often represents strength of character.

The hero had an unshakeable spirit against adversity.
Positive
Generally has positive connotations implying strength.

With an unshakeable optimism, she faced the challenges.
Compare with
steadfastresoluteimmovablecertainfirm
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