Academic IELTS (Band 5 and Below) - Probability

unavoidable or very likely to happen

having a possibility of happening or being the case

having a high possibility of happening or being true based on available evidence or circumstances

able to exist, happen, or be done

having a low chance of happening or being true

having a low chance of occurring

easily anticipated or expected to happen based on past experiences or knowledge

unable to be predicted because of changing many times

improbable or unlikely to happen or be the case

not definitively known or decided

anticipated or predicted to happen based on previous knowledge or assumptions

happening or appearing without warning, causing surprise

expected or certain to happen

doubtful or uncertain in terms of quality, reliability, or legitimacy

describing something that is possible and therefore can be believed

allowing no questions or doubts

difficult to be believed