Byouki

Byouki: (1) sickness (2) illness

病気 -- n, adj.

Aoi

Aoi: (1) blue (2) green

青い -- adj.

Akai

Akai: red

赤い -- adj

Naka

Naka: (1) inside (2) within (3) center

中 -- adv., n., adj-no.

Yami

Yami: (1) dark (2) darkness (3) shady (4) despair

闇  -- adj-no, n.

Hints: there's a manga called Yami no Matsue ( 闇の末裔 )

Kuso, Kusso

Kuso or Kusso: (1) bullshit (2) damn (3) something dirty

糞 or 屎 -- int., expression, adj.

Hint: you usually heard this expression when the character felt annoyed and in bad situation.

Juubun

Juubun (na): (1) plenty (2) enough

十分 -- adj.na

 

Juppun: 10 minutes

十分 -- adv.

Kantan (na)

Kantan (na): (1) simple (2) easy (3) light

簡単 -- adj.na

Hint: if you get confuse between 'kantan' and 'yasashii', please read it here: link which provided you best answers and examples.

Shippai

shippai: (1) mistake (2) failure

失敗 -- n., adj.

Quote: the famous quote on Doctor-X dorama was "Watashi.. shippai shinai no de!" by Daimon-sensei. And actually that was how I remember the word shippai :D

Wagamama (na)

wagamama (na): (1) selfishness (2) egoism

我が侭 -- adj.na, n.

Takusan, takusan (na)

takusan (na): (1) lot (2) many (3) much

沢山 ( たくさん) -- adv., adj-na

Hint: it's kinda rare to me to see takusan written in kanji but now I learn :)

Opposite: sukoshi

Joudan

joudan: (1) joke (2) jest

冗談 -- n., adj

Hints: I should admit that even though I heard this word everywhere, but seeing this dorama title assure me the meaning. Try watching Jodan ja nai! , you might like it. As a phrase it is well translate as You gotta be kidding me, while literally it means 'don't joke (me)!'

Mendokusai, mendoukusai

mendokusai, mendoukusai: (1) bothersome (2) tiresome

面倒臭い -- adj

Hint: when a character faced a person or situation which bothered him or irritating him, the character usually said, "mendokusai naa.."

Dokidoki

dokidoki: (1) thump-thump (2) feeling nervous (3) feel of excitement

どきどき -- adj., adv.

Hint: in shoujo manga, when a girl likes a boy and meets him in school corridor, this 'dokidoki' explains everything...

Zannen (na)

zannen (na): (1) bad luck (2) regret with pity (3) unfortunate (4) disappointment

残念 -- adj-na, n.

Notes: not easy to translate this word. Roughly it depends on situation and intonation. Zannen desu can be translate as 'too bad'. Gaijin Explorer also list it as "It's unfortunate but..." "I am sorry to say..." for 'zannen desu ga..'

A drama called Zannen-na Otto (2015) was widely known as Disappointing Husband. Though, based on reading the synopsis, I personally say that saying Unfortunate Husband fits the story, too.

Yasashii

Yasashii: (1) kind (2) tender (3) gentle

優しい -- adj-i


Yasashii: (1) easy (2) simple

易しい -- adj-i

Hint: see the difference between 'yasashi' ( 易しい )  and 'kantan' at this link, which also provided you best explanation and examples.

Zetsubou

zetsubou: (1) despair

絶望 -- n., adj.

Hints: nothing can beat an anime title "Sayonara Zetsubou Sensei" or Goodbye Mr. Despair.

courtesy myanimelist.net

Binbou (na)

binbou (na): (1) poor (2) poverty

貧乏 -- adj.na

Hint: you don't really read is as bin-bo (long 'o'). Change the 'n' into 'm' so it sounds as 'bimbo'

Hints: There is an anime called Binbou Shimai Monogatari (貧乏姉妹物語) or Poor Sisters Story. It is also good if you can watch a drama called Yamada Tarou Monogatari (Story of Yamada Tarou) where the word 'binbou' was repeatedly very often in many episodes

Baka (na)

baka (na): (1) fool (2) stupid

馬鹿 or 破家 -- adj.na

 Notes: I think writing 'baka' with 馬鹿 is more common. I saw it many times in Peacemaker Kurogane (manga) and much easier to remember because it started with kanji of horse (ba, 馬)

Taisetsu (na)

taisetsu (na): important


大切 (な) -- adj-na