1) Clearly 2) Compellingly 3) Completely and absolutely 4) Convincingly 5) Deeply or completely 6) Effectively 7) Good way to sleep 8) Nice way to sleep 9) One way to be defeated 10) Persuasively 11) Properly suited to audio use 12) Sound 13) Way to sleep 14) With robustness 1) Clearly 2) Fast 3) Firmly 4) Safely 5) Thoroughly 
• (adv.) In a sound manner.
Sound'ly adverb In a sound manner. 
[adv] - deeply or completely
adverb in a complete and thorough manner (`good` is sometimes used informally for `thoroughly`); `he was soundly defeated`; `we beat him good`