Tone (ADJ)
Definition: An author's attitude about the subject
Synonyms
Opinion
Slant
Point of View
Antonyms
Indifferent (this might be a stretch as it's impossible to be completely devoid of attitude)
Sentences
It's important when analyzing a text for an author's tone, to examine the use of diction and syntax.
Please don't take that tone with me as it's quite disrespectful.
Squidward and SpongeBob-"I don't like your tone"