All 8 Uses of

positive
in
War and Peace

I don't wish to marry," she answered positively, glancing at Prince Vasili and at her father with her beautiful eyes.†
Chpt 3

positively = with certainty

I know all about it, and I can tell you positively that Helene is as innocent before you as Christ was before the Jews.
Chpt 5 *

positively = with certainty; or absolutely (used for emphasis)

I don't speak of his capacity as a general, but at a time like this how they appoint a decrepit, blind old man, positively blind?†
Chpt 10

positively = with certainty

Rostopchin was so pleased with the fine role of leader of popular feeling, and had grown so used to it, that the necessity of relinquishing that role and abandoning Moscow without any heroic display took him unawares and he suddenly felt the ground slip away from under his feet, so that he positively did not know what to do.
Chpt 11

positively = absolutely (used for emphasis)

There were then as now conversations and discussions about women's rights, the relations of husband and wife and their freedom and rights, though these themes were not yet termed questions as they are now; but these topics were not merely uninteresting to Natasha, she positively did not understand them.
Chpt 15

Arriving at this conclusion we can reply directly and positively to these two essential questions of history: (1) What is power?†
Chpt 15

positively = with certainty

Prince Andrew had thought and said that happiness could only be negative, but had said it with a shade of bitterness and irony as though he was really saying that all desire for positive happiness is implanted in us merely to torment us and never be satisfied.†
Chpt 13

Definitions:

(1) (positive as in: I'm absolutely positive!)
certain (having no doubt; or used for emphasis)
(2) (positive as in: had a positive effect)
good or beneficial
(3) (positive as in: positive feedback from my boss)
approval or agreement
(4) (positive as in: a positive attitude)
optimistic (expecting or focusing on good things); or agreeable
(5) (positive as in: The test came back positive.)
found a condition or substance to be present
indicating the presence of something being tested for -- especially a disease, condition, or substance
(6) (positive as in: a positive number)
greater than zero (of a number)
(7) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

See a comprehensive dictionary for less common meanings of positive including some in the fields of electricity, physics, chemistry, medicine, philosophy, and grammar. Note that most all senses of positive indicate that something is good or present.