fastness   (Sound)

The fastness has 3 Senses.

• swiftness, speed, fastness
• 素早さ, 速度, スピード, 速さ, 機敏さ, 迅速さ, す早さ
• a rate (usually rapid) at which something happens; "the project advanced with gratifying speed"
• 何かが起こる（通常は敏速な）速さ

• secureness, fixture, fixity, fixedness, fastness
• 不抜, 堅さ
• the quality of being fixed in place as by some firm attachment
• 堅い付着する物体によってあるところに固定される特性

• stronghold, fastness
• 砦, 牙城, 本陣, 城廓, 根城, 本塁, 城郭, 要塞, 堅塁, 堡塁
• a strongly fortified defensive structure
• 堅固に防備を固めた場所