因みに: by the way; incidentally

Misspelling of こんにちは. Since wa is written as は when used as a particle.

虹, 霓: a rainbow

Alternative form of によって (ni yotte)

to not do something and do something else / without doing something / "Verb + ずに + おく": to not do something (in advance); to leave something (in a state) without doing something

皮肉る: to speak cynically or with sarcasm

(informal, onomatopoeia) Representing mischievous snickering.

蟹座, かに座: Cancer (constellation)