List: adjectival nouns or quasi-adjectives (keiyodoshi)

popular  obsolete kanji  search-only kanji form  JLPT N1  noun  noun (generic)  な adjective  adjective (generic)  noun or participle taking the aux. verb する  intransitive verb 

• extramarital sex, affair, fooling around
• infidelity, wantonness, unfaithfulness, inconstancy, fickleness, caprice

popular  rarely used kanji form  な adjective  adjective (generic)  noun  noun (generic) 

• easy, simple, ready
• casual, off-hand, easy-going, careless, artless

popular  JLPT N2  usually written using kana alone  な adjective  adjective (generic) 

• rare, seldom

popular  noun  noun (generic)  noun taking the genitive case particle の  adjective (generic)  な adjective 

• discord, (on) bad terms (with)

popular  rarely used kanji form  noun taking the genitive case particle の  adjective (generic)  な adjective  noun  noun (generic) 

• unhurt, uninjured, unwounded, unscathed, unharmed
• flawless (e.g. gem), unblemished, undamaged, perfect (condition)
• spotless (e.g. reputation), faultless (e.g. performance), perfect (record), without failure, without defeat

popular  な adjective  adjective (generic)  noun  noun (generic) 

• disorder, chaos, confusion

popular  な adjective  adjective (generic)  noun  noun (generic) 

• unreasonable, irrational, outrageous, absurd

popular  な adjective  adjective (generic) 

• ethical

popular  な adjective  adjective (generic)  noun taking the genitive case particle の  noun  noun (generic) 

• out of the question, outrageous, impossible
• irrelevant, not pertinent

popular  noun taking the genitive case particle の  adjective (generic)  な adjective  noun  noun (generic) 

• spirited, energetic