Improbablenesses refer to events or situations that are considered unlikely to happen. Synonyms for this word include improbability, unlikelihood, implausibility and incredibility. These words all imply a sense of disbelief or skepticism towards the likelihood of an occurrence. Other synonyms include remoteness, rareness, and outside chance. These words suggest that the probability of the event is low, but not necessarily impossible. Conversely, the antonyms for improbablenesses are words like certainty, probability, and likelihood, which imply that the event is very likely or almost certain to happen. It is important to be familiar with different synonyms and antonyms, as they can be very helpful in expanding your vocabulary and improving writing skills.