Following is a list of English adjectives that are non-standard in that they are not derived from the same root as the corresponding noun, or they are based on the same root but in a way that is non-intuitive even to a native English speaker. In some cases, the non-standard adjective is merely an alternative to a standard one. For example, for an adjective form of 'charity' we could say 'eleemosynary', though in most cases 'charitable' would work just as well.
The list is presented as:
- noun form - adjective form
- abdomen - ventral, alvine
- abdominal cavity - celiac
- accuracy - veracious
- actors, acting - histrionic
- adjectives - epithetic
- aesthetic pleasure - sensuous
- aging, the aged - geriatric
- agriculture - georgic, geoponic
- alcohol - bibulous, vinic
- algae - algal, algous
- alphabet - abecedarian
- animals - zoological, zoic
- anklebone - astragatar
- ants - myrmecological, formic
- anus - anal
- apes - simian
- apex - apical
- Aphrodite - cytherean
- apples - pomaceous, malic
- aristocracy - genteel
- Aristotle - peripatetic
- arm - brachial
- armpit - axillary
- arrangement - tactic
- arrows - sagittal
- ashes - cinerary
- asses - asinine
- authors - auctorial
- aviation - aerial
- back of the head - occipital
- backside - dorsal
- badgers - meline
- barbers - tonsorial
- bathrooms - lavatorial
- baths, bathing - balneal
- bats - chirpoteran, vespertilian
- bears - ursine
- bees - apian
- beeswax - cerotic
- bells - tintinnabulary
- belly - ventral
- bile - cholic
- birds - avian, ornithic, volucrine
- birds of prey - raptorial
- birth - parturient
- birthdays - genethliac
- bishops - episcopal
- Black Sea - euxine
- bladder - cystic, vesical
- blood - sanguineous, hemal, hematal, hematic, hemic
- bloodshed - sanguineous
- blood vessels - vascular, hemal, hematal
- bodily motion - gestic
- body - somatic, corporal, corporael, physical
- body/mind - pyschosomatic
- bones - osteal, osseus, osteoid
- boundaries - terminal
- boxing - fistic, pugilistic
- brain - cerebral, cerebric, encephalic
- branches - ramal
- branching patterns - cladistic
- breastbone - sternal
- breasts - mammary, mammilary
- breeding season - nuptial
- bridges - pontal
- brothers - fraternal
- buds - blastous
- buildings - edificial
- bulls - taurine
- business - commercial
- butter - butyric
- buttocks - gluteal