Evil is the odd term because it is not about beauty.
Accurate is another odd term because it also is not about beauty.
Imprudent is the word that doesn't fit. It's a noun describing a person's nature or behavior. All the other terms are verbs relating to approaches to argument.
Excommunicate is the odd term because it is truly about communication. It is actually about a family or corporation shunning a family member or employee. Symbolize is another odd term because it is not about communication.
Listen is the odd term because it is not about expressing words.
Offhand is the odd term because it has nothing to do with unplanned actions.
The odd one out is "accuse". All the others carry the idea of forgiveness or of reducing the seriousness of something, such as an accusation.
Contract is the odd term because it does not have anything to do with expansion but rather shrinkage or closing in.
An informal synonym for the term optimal is the word ace. Ideal is also a good synonym, as well as matchless. There are a lot of other synonyms that can be found in a thesaurus or online.
"Unmatchless" is not a standard English word. The correct term would be "unmatched" or "matchless" to convey the idea of being superior or without equal.
There are a variety of companies that offered term insurance. You can compare rates among these companies. Term Life Insurance rates are based on the insured's age and medical history.
The term "stet" is defined to mean "let it stand." Stet is a term that is commonly used among those who proofread items, such as a manuscript of a book.
exists all the other words basically mean 'doesn't exist anymore'
A rose is a plant with sharp thorns on the stems. If you find "a rose among the thorns," you find a soft flower among the sharp thorns. The term can be used to mean anything nice found among not-so-nice things. You might say that someone is "a rose among thorns" if everyone around them is either unpleasant or incompetent.