feeling jealous of another's advantages, possessions, or experiences that one lacks
used to refer to someone who keeps repeating the same thing in a way that is annoying
someone who does or says things that prevent others from having a good time

水を差す人(みずをさすひと), 雰囲気を壊す人(ふんいきをこわすひと)

a person who can no longer feel any strong emotions, often after experiencing something heartbreaking

空っぽの殻 (からっぽのから), 無情な殻 (むじょうなから)

one's lack of courage to deal with painful or dangerous situations

臆病(おくびょう)な部分, 腰抜け(こしぬけ)

used to refer to someone who becomes extremely afraid of or nervous about even the smallest things
a person who doubts or refuses to believe anything that is presented to them without evidence or proof

疑い深いトマス, 懐疑的なトマス

used to refer to someone or something that is extremely quiet and does not make much noise
a person who is always nervous or stressed and is therefore unable to have a calm and organized life

精神的に不安定な人, 神経質な人

used to refer to someone or something that shows very little motion or does nothing
a negative attitude or reaction toward something that one desires but cannot have or achieve, often by minimizing its importance or worth

妬み(ねたみ), 負け犬の遠吠え(まけいぬのとおばえ)

the feeling of discontent caused by lacking someone else's possessions, accomplishments, etc.
