As a communications professtional of 25 years, I have learned that "anonymous" and "respectful" often are (if not usually are) mutually exclusive. Your question suggests you want to criticize your teacher. If so, I wouldn't try to do that through anonymous written communication, especially because written communication in sensitive situations requires enormous skill and is quite easily misconstrued.
Please remember: Everyone's writing has a "fingerprint." I always know what member of my staff composed unsigned documents. In other words, your teacher will probably know it's you anyway.
If it were my problem, I would speak face to face with my teacher, where respectful tone, facial expression and body language are visible.
If you have a serious problem you believe must be addressed and you fear retribution, seek out the assistance of a guidance counselor.
The Anonymous Letter - 1911 was released on: USA: 7 October 1911
Nameless; of unknown name; also, of unknown or unavowed authorship; as, an anonymous benefactor; an anonymous pamphlet or letter.
Anonymous means unknownThe letter was received from an anonymous source.Many authors keep their names anonymous.In police investigations some names are kept anonymous from the public.
Author unknown, also Anonymous.
respectful
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An anonymous letter is a letter that does not bear the name of the writer. This type of letter typically conceals the writer's identity for various reasons such as privacy, fear of repercussions, or to create a sense of mystery.
Under most circumstances, an anonymous letter would remain anonymous. Law enforcement agencies follow the rules and regulations of their particular jurisdiction and may have internal policies of their own. However, anonymous information is generally not allowed to be used as evidence.
Respectful Reliable
effort
Anonymous
anonymous incognito