As verbs the difference between obtain and forfeit

is that obtain is to get hold of; to gain possession of, to procure; to acquire, in any way while forfeit is to suffer the loss of something by wrongdoing or non-compliance.

As a noun forfeit is

a penalty for or consequence of a misdemeanor.

As an adjective forfeit is

lost or alienated for an offense or crime; liable to penal seizure.

As an adjective solemn

is deeply serious and somber.

As an adverb sincerely is

in a sincere or earnest manner; honestly.

As verbs the difference between proliferate and outbreak

is that proliferate is to increase in number or spread rapidly while outbreak is to burst out.

As a noun outbreak is

an eruption, sudden appearance.