Here's what rhymes with certainties.

Consider these alternatives

certitude / food absolutes / groups intuitions / conditions inevitability / stability ruminations / relations platitudes / groups cliches / days hypocrisies / crises consolations / relations aplenty / twenty impossibility / stability sentimentality / personality inhibitions / conditions dispelled / help workaday / day fatalistic / characteristic anachronisms / conditions dogmatism / given immutable / suitable