| acapnial | (adjective) relating to or demonstrating acapnia | Synonyms: acapnic, acapnotic |
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| achenial | (adjective) pertaining to dry one-seeded indehiscent fruit | - |
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| antimonial | (adjective) containing antimony | - |
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| archegonial | (adjective) of or relating to an archegonium | Synonyms: archegoniate |
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| baronial | (adjective) impressive in size, manner, or appearance | Synonyms: imposing, noble, stately |
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| bicentennial | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentenary |
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| biennial | (adjective) having a life cycle lasting two seasons | Synonyms: two-year |
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| (adjective) occurring every second year | Synonyms: biyearly |
| bimillenial | (adjective) of or relating to a bimillennium | - |
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| brachycranial | (adjective) having a short broad head with a cephalic index of over 80 | Synonyms: brachycephalic, brachycranic |
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| catamenial | (adjective) of or relating to menstruation or the menses | Synonyms: menstrual |
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| centennial | (adjective) of or relating to or completing a period of 100 years | Synonyms: centenary |
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| ceremonial | (adjective) marked by pomp or ceremony or formality | - |
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| colonial | (adjective) of or relating to or characteristic of or inhabiting a colony | - |
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| (adjective) of animals who live in colonies, such as ants | - |
| (adjective) composed of many distinct individuals united to form a whole or colony | Synonyms: compound |
| congenial | (adjective) suitable to your needs | - |
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| (adjective) (used of plants) capable of cross-fertilization or of being grafted | - |
| cranial | (adjective) of or relating to the cranium which encloses the brain | - |
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| dolichocranial | (adjective) having a relatively long head with a cephalic index of under 75 | Synonyms: dolichocephalic, dolichocranic |
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| genial | (adjective) of or relating to the chin or median part of the lower jaw | Synonyms: mental |
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| (adjective) diffusing warmth and friendliness | Synonyms: affable, amiable, cordial |
| (adjective) agreeable, conducive to comfort | Synonyms: kind |
| intracranial | (adjective) within the skull | - |
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| matrimonial | (adjective) of or relating to the state of marriage | Synonyms: marital, married |
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| menial | (adjective) used of unskilled work (especially domestic work) | Synonyms: humble, lowly |
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| millennial | (adjective) relating to a millennium or span of a thousand years | Synonyms: millennian |
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| patrimonial | (adjective) inherited or inheritable by established rules (usually legal rules) of descent | Synonyms: ancestral, hereditary, transmissible |
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| penial | (adjective) of or relating to the penis | Synonyms: penile |
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| perennial | (adjective) lasting three seasons or more | - |
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| (adjective) recurring again and again | Synonyms: recurrent, repeated |
| (adjective) lasting an indefinitely long time; suggesting self-renewal | - |
| postmillennial | (adjective) of or relating to the period following the millennium | - |
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| quincentennial | (adjective) of or relating to a 500th anniversary | Synonyms: quincentenary |
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| semicentennial | (adjective) of or relating to or marking the 50th anniversary | Synonyms: semicentenary |
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| testimonial | (adjective) of or relating to or constituting testimony | - |
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| (adjective) expressing admiration or appreciation | - |
| tricentennial | (adjective) of or relating to or completing a period of 300 years | Synonyms: tricentenary |
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| triennial | (adjective) occurring every third year or lasting 3 years | - |
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| unceremonial | (adjective) without ceremony or formality | Synonyms: unceremonious |
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| uncongenial | (adjective) not suitable to your tastes or needs | Synonyms: incompatible |
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| (adjective) used of plant stock or scions; incapable of being grafted | - |
| (adjective) very unfavorable to life or growth | Synonyms: hostile, unfriendly |
| venial | (adjective) easily excused or forgiven | Synonyms: excusable, forgivable |
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| (adjective) warranting only temporal punishment | Synonyms: minor |
| vicennial | (adjective) occurring once every 20 years | - |
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