" soundly "

1: to a full extent or degree;

  * e.g., " ... we'll keep working at it until you're soundly satisfied with the result "

•  Synonyms : 

•  all,

•  all of,

•  all over,

•  altogether,

•  clean,

•  completely,

•  dead,

•  enough,

•  entire,

•  entirely,

•  even,

•  exactly,

•  fast,

•  flat,

•  full,

•  fully,

•  heartily,

•  out,

•  perfectly,

•  plumb,

•  quite,

•  thoroughly,

•  through and through,

•  totally,

•  utterly,

•  well,

•  wholly,

•  wide

•  Antonyms : 

•  half,

•  halfway,

•  incompletely,

•  part,

•  partially,

•  partly

1: according to the rules of logic;

  * e.g., " ... sound reasoning alone should tell you that the result is invalid "

•  Synonyms : 

•  analytic,

•  coherent,

•  consequent,

•  good,

•  logical,

•  rational,

•  reasonable,

•  sensible,

•  valid,

•  well-founded,

•  well-grounded

•  Antonyms : 

•  illegitimate,

•  illogical,

•  incoherent,

•  inconsequent,

•  inconsequential,

•  invalid,

•  irrational,

•  unreasonable,

•  unsound,

•  weak

2: enjoying health and vigor;

  * e.g., " ... the horse is getting along in years, but still perfectly sound "

•  Synonyms : 

•  able-bodied,

•  bouncing,

•  fit,

•  hale,

•  healthy,

•  hearty,

•  robust,

•  well,

•  well-conditioned,

•  whole,

•  wholesome

•  Antonyms : 

•  ailing,

•  diseased,

•  ill,

•  sick,

•  unfit,

•  unhealthy,

•  unsound,

•  unwell

3: marked by the ability to withstand stress without structural damage or distortion;

  * e.g., " ... the shed looks flimsy, but it's actually surprisingly sound "

•  Synonyms : 

•  bombproof,

•  fast,

•  firm,

•  stable,

•  stalwart,

•  strong,

•  sturdy

•  Antonyms : 

•  rickety,

•  unsound,

•  unstable,

•  unsteady