sounder

(noun) a device for making soundings.

(adj) financially secure and safe. Synonyms: sound (vs. unsound). Examples: "Sound investments." "A sound economy."

(adj) exercising or showing good judgment. Synonyms: healthy, intelligent, levelheaded, level-headed, sound. Examples: "Healthy scepticism." "A healthy fear of rattlesnakes." "The healthy attitude of french laws." "Healthy relations between labor and management." "An intelligent solution." "A sound approach to the problem." "Sound advice." "No sound explanation for his decision."

(adj) in good condition; free from defect or damage or decay. Synonyms: sound (vs. unsound). Examples: "A sound timber." "The wall is sound." "A sound foundation."

(adj) in excellent physical condition. Synonyms: good, sound. Examples: "Good teeth." "I still have one good leg." "A sound mind in a sound body."

(adj) logically valid. Synonyms: reasoned, sound, well-grounded. Example: "A sound argument."

(adj) having legal efficacy or force. Synonyms: legal, sound, effectual. Example: "A sound title to the property."

(adj) free from moral defect. Synonyms: sound. Example: "A man of sound character."

(adj) (of sleep) deep and complete. Synonyms: heavy, profound, sound, wakeless. Examples: "A heavy sleep." "Fell into a profound sleep." "A sound sleeper." "Deep wakeless sleep."

(adj) thorough. Synonyms: sound. Example: "A sound thrashing."