安全で確実に
their houses were soundly built
彼らの家はしっかりと建てられていた
十分な根拠で
there is soundly based reason for optimism
楽観的な見方には十分な根拠がある
ぐっすりと
I slept soundly for the first time since I've been here
ここに来てから初めてぐっすり眠れた
完全に
Jim was soundly defeated by his old opponent
ジムは昔の対戦相手に完敗した