| Subject | English | Japanese |
| gen. | n n-suf book of informal essays | 夜咄 |
| gen. | n n-suf book of informal essays | 夜話 news2 nf39 |
| gen. | n booklet constituting an informal living will | エンディング・ノート (containing wishes regarding one's hospitalization or funeral, and perhaps one's life story, messages to loved ones, etc.) |
| gen. | n booklet constituting an informal living will | エンディングノート (containing wishes regarding one's hospitalization or funeral, and perhaps one's life story, messages to loved ones, etc.) |
| gen. | n ceremony in which an abdicated emperor puts on informal court clothes | 布衣始め (e.g. kariginu, eboshi) |
| gen. | n ceremony in which an abdicated emperor puts on informal court clothes | 布衣始 (e.g. kariginu, eboshi) |
| abbr. | emperor's informal robes | 麹塵 |
| gen. | n emperor's informal robes | 麹塵袍 io |
| gen. | n emperor's informal robes | 麹塵の袍 |
| gen. | n in one's informal summer kimono | 浴衣掛け |
| gen. | informal and easy to understand | 平俗 (of writing, etc.) |
| gen. | n informal care | インフォーマル・ケア |
| gen. | n informal care | インフォーマルケア |
| gen. | n informal clothes | 略服 (dress) |
| gen. | n vs informal consent | 内諾 news2 nf36 spec2 |
| gen. | informal contract | 不様式契約 |
| gen. | n informal crest | 裏紋 |
| gen. | n informal discussion | 非公式協議 |
| gen. | informal documents | 裏の書類 |
| gen. | n informal dress | インフォーマル・ドレス |
| gen. | n informal dress | インフォーマルドレス |
| obs. | n informal family crest | 替紋 |
| obs. | n informal family crest | 代紋 |
| obs. | n informal family crest | 替え紋 |
| tech. | informal garden | 不規則庭園 (ふきそくていえん) |
| gen. | n informal get-together | 懇談会 |
| gen. | informal group | 非公式集団 |
| gen. | n informal interview in which reporters surround a public figure and prod him for an off-the-cuff response | ぶら下がり取材 |
| gen. | n obsc informal kasaya worn primarily by adherents of Pure Land Buddhism | 威儀細 |
| gen. | n informal noh performed in light clothes | 袴能 (during the summer) |
| gen. | n informal organisation | インフォーマル・オーガニゼーション |
| gen. | n informal organisation | インフォーマルオーガニゼーション |
| gen. | n informal organization | インフォーマル・オーガニゼーション |
| gen. | n informal organization | インフォーマルオーガニゼーション |
| gen. | n informal promise of employment | 内内定 |
| gen. | n informal promise of employment | 内々定 |
| gen. | n informal resignation | 進退伺 |
| gen. | n informal resignation | 進退伺い news2 nf45 spec2 |
| gen. | informal riding shoes without an ankle strap | 半靴 |
| gen. | n informal seal | 認印 io |
| gen. | n informal seal | 認め印 ichi1 |
| gen. | n informal social gathering | 親ぼく会 |
| gen. | n informal social gathering | 親睦会 |
| gen. | n informal style | 軟らかい文章 |
| gen. | n informal style | 柔らかい文章 |
| gen. | n informal summer clothes for men | 甚兵衛 (short jacket and trousers) |
| gen. | n informal summer clothes for men | 甚平 (short jacket and trousers) |
| gen. | n vs informal talk | 懇談 news1 nf03 |
| gen. | n informal talk given as by a politician, etc. aboard a train | 車中談 |
| gen. | n Japanese traditional informal female sitting posture | 割座 |
| abbr. | aux-v suf negative verb ending used in informal speech | ん (abbr. of negative verb ending "nu") |
| gen. | n small informal Italian restaurant | トラットリア |
| gen. | n type of informal noh musical performance | 舞囃子 |
| gen. | n verbal or informal, unsubstantiated assertion | 自己申告 |