| likely | (adjective) has a good chance of being the case or of coming about | - |
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| (adjective) within the realm of credibility | - |
| (adjective) expected to become or be; in prospect | Synonyms: potential |
| (adverb) with considerable certainty; without much doubt | Synonyms: belike, in all likelihood, in all probability, probably |
| unlikely | (adjective) has little chance of being the case or coming about | - |
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| (adjective) not likely to be true or to occur or to have occurred | Synonyms: improbable |
| (adjective) having a probability too low to inspire belief | Synonyms: improbable, unbelievable, unconvincing |