What's the difference between sad and swad?

Sad

Definition:

(supperl.) Sated; satisfied; weary; tired.
(supperl.) Heavy; weighty; ponderous; close; hard.
(supperl.) Dull; grave; dark; somber; -- said of colors.
(supperl.) Serious; grave; sober; steadfast; not light or frivolous.
(supperl.) Affected with grief or unhappiness; cast down with affliction; downcast; gloomy; mournful.
(supperl.) Afflictive; calamitous; causing sorrow; as, a sad accident; a sad misfortune.
(supperl.) Hence, bad; naughty; troublesome; wicked.
(v. t.) To make sorrowful; to sadden.

Example Sentences:

(1) She loved us and we loved her.” “We would have loved to have had a little grandchild from her,” she says sadly.
(2) Wimbledon said the world No1 Williams had been suffering from a viral illness and it was a sad and bizarre end to the American’s tournament, not to mention a worrying sight, seeing her hardly able to play.
(3) Sadly, the bullet will not only kill off Greece’s future in Europe.
(4) Calum MacLean, Grangemouth Petrochemicals chairman, says, “This is a hugely sad day for everyone at Grangemouth.
(5) Sadly, the Jewish fanatic who assassinated Rabin in 1995 achieved his broader aim of derailing the peace train.
(6) It also devalues the courage of real whistleblowers who have used proper channels to hold our government accountable.” McCain added: “It is a sad, yet perhaps fitting commentary on President Obama’s failed national security policies that he would commute the sentence of an individual that endangered the lives of American troops, diplomats, and intelligence sources by leaking hundreds of thousands of sensitive government documents to WikiLeaks, a virulently anti-American organisation that was a tool of Russia’s recent interference in our elections.” WikiLeaks last year published emails hacked from the accounts of the Democratic National Committee and John Podesta, chairman of Hillary Clinton’s election campaign.
(7) I watched as she made the briefest eye contact with me on their way back, the flicker of hurt and sadness in her eyes reflecting mine, before the shutters came down.
(8) Only at 3 days did total plasma volume of SAD rats show a modest reduction of about 16% (P less than 0.05 vs. sham-operated plus unoperated controls).
(9) These sad numbers show that more Washington spending, threats of higher taxes on small businesses, and excessive government regulations don't create a healthy environment for job growth," Boehner said.
(10) Thirty-two nursing students were shown silent films in which 10 normal and 10 schizophrenic women described a happy, sad, and an angry personal experience.
(11) World Wildlife Fund Great Barrier Reef campaigner Richard Leck said it was a sad day for the reef and anyone who cared about its future.
(12) It is so sad, we don’t let her go out even if the weather is nice,” he says.
(13) During interviews, married couples experiencing infertility reported emotional reactions such as sadness, depression, anger, confusion, desperation, hurt, embarrassment, and humiliation.
(14) Half of the rats in each group had SAD surgery 1 week prior to study.
(15) There’s an overwhelming sadness among kids like that who have been kept there for a very long time.
(16) It is sadly slightly the territory we have inherited,” he said.
(17) In a statement the family said they were left "extremely sad and disappointed" by the verdicts: "We appreciate the work and effort over the years since events on Broadwater Farm that night in trying to bring people to justice.
(18) Moreover, no differences were found in abnormal lung function patients with and those without SAD in demographic, clinical, roentgenologic, and serologic features and results of pulmonary function tests.
(19) It is sad that the BBC chose to give Nick Griffin a platform.
(20) The only thing I'd say is that I know, from people who've told me firsthand, that sadly mixed marriages can be a bit conflicted on everyday issues.