positiveness vs favourableness

positiveness and favourableness both are nouns.

Word	Noun	Adjective	Verb	Adverb
positiveness	Yes	No	No	No
favourableness	Yes	No	No	No

As nouns, positiveness and favourableness are synonyms defined as:

positiveness and favourableness: the quality of being encouraging or promising of a successful outcome

Other synonyms of positiveness include advantageousness, favorableness, positivity, profitableness.

positiveness (noun)	favourableness (noun)
a quality or state characterized by certainty or acceptance or affirmation and dogmatic assertiveness	the quality of being encouraging or promising of a successful outcome
the quality of being encouraging or promising of a successful outcome
the quality of being undeniable and not worth arguing about
an amount greater than zero
the character of the positive electric pole