TASK DEFINITION: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
PROBLEM: Question: I am looking for a word or phrase which can be used in the sentence: It is a rather old, but _________________ technology. The word or phrase should address a technology that is totally investigated, researched in detail, and thoroughly optimised, so there is nothing more to find out or improve. 
Answer: I don't know of a technology that cannot be improved, but we often use the term mature to describe technology that's deemed developed enough to be left alone: A mature technology is a technology that has been in use for long enough that most of its initial faults and inherent problems have been removed or reduced by further development. In some contexts, it may also refer to technology that has not seen widespread use, but whose scientific background is well understood. Wikipedia mature 6. No longer subject to great expansion or development. Used of an industry, market, or product. American Heritage® Dictionary.

SOLUTION: yes

PROBLEM: Question: Could you tell me some suitable idioms to express this situation: A guy told you a joke, but it's not funny at all. In Japanese, we say "He slipped" or "His joke was so cold that the air got frozen," for that situation. Are there any similar phrases in English? 
Answer: Sarcastically I am smiling, but my heart's crying inside. 2.you have nailed the coffin of laughter with a golden nail. oh God, please Kill Me . Hang Yourself , would be the one chooses often too Would be the real expression for an unfunny joke.

SOLUTION: no

PROBLEM: Question: Is there a word which has this definition: usage of vulgar or abusive words too often especially while chatting or talking to someone or while giving a speech. What do you call a person who uses abusive words too often without needing to. 
Answer: Perhaps not as technically accurate, but I've always liked uncouth: discourteous, rude, uncivil. See boorish. ... as listed under the Synonyms section of dictionary.com's entry An anonymous user suggested "couthless" as an alternative - but the online dictionary I use to double-check my thinking didn't list it as a "real" word. (Couth is a real word.) Your mileage may vary.

SOLUTION:
no