| alluvial | (adjective) of or relating to alluvium | - |
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| antediluvial | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvian |
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| convivial | (adjective) occupied with or fond of the pleasures of good company | Synonyms: good-time |
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| diluvial | (adjective) of or connected with a deluge | Synonyms: diluvian |
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| exuvial | (adjective) of or relating to the cast-off skins or cuticles of various animals | - |
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| fluvial | (adjective) of or relating to or happening in a river | - |
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| jovial | (adjective) full of or showing high-spirited merriment | Synonyms: gay, jocund, jolly, merry, mirthful |
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| synovial | (adjective) relating to or secreting synovia | - |
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| trivial | (adjective) concerned with trivialities | - |
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| (adjective) of little substance or significance | Synonyms: superficial |
| (adjective) (informal) small and of little importance | Synonyms: fiddling, footling, lilliputian, little, niggling, petty, picayune, piddling, piffling |