Choose the perfect synonym or antonym for the word

Probable

/ˈprɒbəbəl/

Likely to happen or to be true; having a good chance of occurring or being real.

Synonyms:

They calculated the probable reaction.

I thought it dashed possible, if not probable.

Dr. Kuishiki diagnosed a probable case of peridontitis.

From Middle French probable, from Latin probābilis meaning laudable, able to be proved, derived from probāre, to test or prove.

90 mentions per 1 million words

Often

Hint: Frequency according to COCA