-kun~

usually used between males of the same rank, but can be applied to women, as well. Also can be used by an adult addressing a child, as in "-chan" or as a suffix for a male friend under 21.

...ka na~

I wonder (whether)

K'so/Kuso~

Damn it!/Shit!

kagayaku~

glittering; sparkling.

kage~

shadow

kagi~

key

kaigan~

seashore

kamei~

family name

kamome~

seagull

kanashii~

sad

kandai (na)~

generous

kanetsu-ki~

healer

kanji~

1. Chinese character (symbol) 2. Feeling

karasu~

crow

kawaii~

cute, sweet, darling

kawaikunee~

Uncute! (it's said that kawaikunee's a rougher version of the real thing, 'kawaii ku nai')

kaze~

breeze

ki~

1. spirit; feeling; mind, heart 2. energy [in my personal thinking, since everyone's all usin' it as that. Youki, reiki, etc. ~IB] 3. tree, wood

kicho(na)~

valuable

kikan~

period of time

kiken~

peril

kiji~

pheasant

kimi~

sensation [or it could be: you (male informal way of saying that's usually used among friends and people of the same 'rank')]

kin~

gold

kino~

yesterday
[wow… Sailor Jupiter's last name… I didn't find all the Sailor seishi's names though… anybody?]

kirei~

beautiful

kisama~

you (a rough saying of the word; if said with enough feeling, can be translated to "Bastard!")

kitai~

vapor

kitsune~

fox

kitto~

perfectly; absolutely; for sure.

kiwotsukete~

"Take care" or "Take care of yourself."

kizu~

flaw

kizu-ato~

scar

kodomo~

child (can be shortened to merely "ko", when tagged onto a name)

koe~

voice

kogan~

lakeshore

kogeki~

an attack

koi~

1. (another term) love 2. carp (fish) 3. Request 4. Goodwill, favor; act, deed; behavior

koibito~

girlfriend; boyfriend; lover; sweetheart

koishi~

pebble

koji~

orphan

kojin~

Westerner; deceased
[yep, we got it from Fushigi Yuugi. Thank you, Nakago!]

kokai~

regret

kokoro~

heart/mind/soul

komichi~

path; lane

komori~

bat (animal)

koneko~

kitten

konnan~

difficulty; trouble; hardship

konnichi wa (also can be spelled 'konnichiwa')~

hello!/good afternoon

konzatsu~

confusion, jumble, disorder

koorime~

ice maiden (YYH concept)

Kokuryuuha~

Black Dragon

kori~

ice

korogi~

cricket

korose~

kill (if you say it to someone, it basically means "I'll kill you" - the full sentence for that would be "omae o korosu")

koroshimasu~

kill

kosan~

surrender

kosei~

revival (regeneration)

kosen~

ray

koshin~

renewal

kotsu~

knack

kudasai~

please

kujaku~

peacock

kuko~

airport

kuma~

bear (animal)

kurae~

A term usually used before using an attack in manga, and occasionally on anime, too.
(could be translated as 'take this!')

kurai~

dark, gloomy, dim (light)

kuraihana~

dark flower

kuro bara~

black rose

kuroi/ kuro (no)~

black

kurushimi~

agony

kusa~

herb, grass, weed, plant

kusame~

light rain; drizzle

kusari~

chain

kyoudai~

brother

kyukyusha~

ambulance