Antonyms:

precariousness, uncertainness, uncertainty

being unsettled or in doubt or dependent on chance

types:

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cert

an absolute certainty

ineluctability, unavoidability

the quality of being impossible to avoid or evade

inevitability, inevitableness

the quality of being unavoidable

surety

something clearly established

indisputability, indubitability, unquestionability, unquestionableness

the quality of being beyond question or dispute or doubt

moral certainty

certainty based on an inner conviction

predictability

the quality of being predictable

slam dunk

something that is a sure to occur; a foregone conclusion

definiteness, determinateness

the quality of being predictable with great confidence

incontrovertibility, incontrovertibleness, positiveness, positivity

the quality of being undeniable and not worth arguing about

demonstrability, provability

capability of being demonstrated or logically proved

givenness

the quality of being granted as a supposition; of being acknowledged or assumed

type of:

quality

an essential and distinguishing attribute of something or someone