unshakable
adjective
or
unshakeable
/ˌʌnˈʃeɪkəbəl/
or
unshakeable
/ˌʌnˈʃeɪkəbəl/
Britannica Dictionary definition of UNSHAKABLE
[more unshakable; most unshakable]
:
too strong to be changed, weakened, or destroyed
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Their love was unshakable.
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our unshakable belief in equal treatment
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an unshakable faith
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He had the unshakable feeling that something was wrong.