EN fastness
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{substantivo}

1. geral

fastness (também: solidity, strength, robustness, soundness)
fastness (também: fortitude, fortress, hardiness, strength)
fastness (também: force, forcefulness, might, mightiness)
fastness (também: fixity, stability)

2. "stronghold", poético

fastness (também: lodge, recourse, refuge, traffic island)