Meaning:Dyspeptic is a person with poor digestion, something that relates to poor digestion or a depressed person.
Example: A common dyspeptic type would be an old man shouting "get off my lawn!" to kids.
Synonyms: Crabby, Mean, Grouchy, Irritable
Antonyms: Amiable, Good-Natured

Meaning: Pulchritudinous is used to describe a person of breathtaking, heartbreaking beauty.
Example:Those pulchritudinous movie stars have it all.
Synonyms: Beautiful, Alluring, Admirable, Attractive
Antonyms: Unattractive, Ugly

Meaning: Scurrilous is something that is very abusive, or is scandalous and potentially harmful rumors spread to ruin someone's reputation,
Example: They believed outrageous and scurrilous tales about democratic presidential nominee Hillary Clinton.
Synonyms:Vulgar, Defamatory, Indecent, Lewd, Offending
Antonyms: Clean, Decent, Moral, Pure

Meaning: Unalloyed means something which is not alloyed, not mixed with other substances, pure.
Example: There is no unalloyed benefit from higher inflation for anyone.
Synonyms: Absolute, Genuine, Bona Fide, Pure
Antonyms: Indefinite, Dubious, Uncertain, Unsure

Meaning: A dilettante is a dabbler or a person who cultivates an interest without really committing or learning anything in depth.
A dilettante is an amateur, often one who pretends to be very knowledgeable.
Example: A political dilettante clown is the new republican party nominee.
Synonyms: Amateurish, Rookie, Tenderfoot, Unskilled
Antonyms: Professional, Expert