So firm, strong, or stable that it cannot be shaken, moved, or weakened; impossible to disturb or change.
From 'un-' (not) + 'shakable' (able to be shaken), derived from Old English 'shacian.' The prefix 'un-' negates the quality, emphasizing absolute stability and permanence.
Medieval philosophers and theologians obsessed over finding 'unshakable' truths—this word captures the philosophical quest that drove both science and religion, the human need to find something solid and permanent in a constantly changing world.
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