If you mean a gesture/action/sound to convey information then, Message, gesture or warning
7 to 10 days
To write a letter requesting a fridge for class 7, start with your address and the date at the top. Then, address the letter to the appropriate authority, such as your school principal or teacher. In the body, clearly state your request, explaining why having a fridge would benefit students, such as for storing food or drinks during school hours. Finally, politely close the letter and sign your name.
i would say about 7 minutes from experience
1. Clear 2. Concise 3. Correct 4. Courteous 5. Conversational 6. Convincing 7. Complete
http://www.citesales.com/213-7-cs-business-letter-writing.html
Skill
Bravery.
Unusual is a synonym for not ordinary.
A seven-letter synonym for "astounding" is "amazing."
Antique has a synonym of obsolete. Obsolete has a synonym of outmoded. Since outmode is a transient verb it is always conjugated. But outmode is a word, it is 7 letters and it is a synonym for antique.
A prefix is an affix placed before the root of a word. There is no 7-letter prefix for "unworthy". A synonym is a word with a similar meaning. Some 7-letter synonyms for "unworthy" are beneath, nothing & ignoble.
"SIAMESE", although I'm not sure it's politically correct.
painful
A 7 letter word for an unproven belief is an opinion. An opinion is something that you think and believe but either cannot or have not factually proven.
The only 7-letter synonym for peace (the answer to this question) may be harmony. But it does not represent an actual period of time as peace does.
The word Mollusk is a 7 letter word.
A synonym for "finished" that has seven letters is "completed."