@layman,
Actually, I prefer the word "sardonic" to "sarcastic." According to the dictionary, the root of this word was "used by Homer to describe bitter or scornful laughter."
Some dictionary definitions of "sardonic:"
Quote:disdainfully or skeptically humorous : derisively mocking (M-W)
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Grimly mocking or cynical. (Oxford)
While looking, I came across this page on the web:
Quote:Difference Between Sarcastic and Sardonic
“Sardonic” and “sarcastic” are two words which are very similar in meaning and used almost in the same manner, but their origin, their actual meaning, and their usages are different from each other. They are so close that they are often confused as being interchangeable.
Sarcastic
“Sarcastic” refers to a remark which is bitter, derisive, contemptuous, sharp, and a taunt meant to hurt someone. It is a remark which is heavily laced with irony. Though irony and sarcasm are not the same thing, yet the sarcastic remarks have irony involved. That is, the meaning of what is being said is opposite of what it is intended to mean. It refers to the intention of someone bullying or ridiculing someone by saying something hurtful, and its main feature is inversion. For example, The joke was so funny that people decided to keep a straight face.
Usage
Sarcastic remarks or sarcasm can be used directly or indirectly to show contempt for someone. For example, “You couldn’t add two plus two if you had the whole class helping you.” It can be used indirectly too, for example, “What a mathematician you have become!” It is mainly expressed by vocal modulations.
Sardonic
Sardonic remarks refer to mockery, cynicism, derision, and scorn. One of the main features of this word is it is sometimes considered humor in the times of adversity. For example, The food prisoners get is so good that they hardly chew it. It involves very bitter feelings said with disdain.
Usage
It is used to express cynicism, derision, and skeptical humor by writing, commenting, or a particular gesture. It is used to hurt someone’s feelings.
Summary:
1.Sarcastic remarks and sardonic remarks have similar but different meanings.
2.The main feature of sarcasm is that it is laced with irony. Sardonic remarks are humor in the face of adversity.
3.One can apologize for a sarcastic remark to pacify someone, but sardonic remarks are often to oneself and, thus, cannot be apologized for.
http://www.differencebetween.net/language/words-language/difference-between-sarcastic-and-sardonic/
But, for me, the same word can be used either sardonically or sarcastically. "Cheese-eater," for example.