How to say you don't have to be so formal. in Japanese
1)
固い固い(katai) (adj-i) hard/solid/tough/stiff/tight/wooden/unpolished/strong/firm/safe/steady/honest/steadfast/obstinate/stubborn/bookish/formal/stuffyことこと(koto) (prt) particle indicating a command/particle indicating mild enthusiasm/particle indicating a gentle interrogative/particle used to soften a judgment or conclusion言う言う(iu) (v5u) to say/to call/to go/to make a noiseなな(na) (prt) connects adj to noun/indicates emotion or emphasis/command/prohibitionよよ(yo) (num) four。。(。) Japanese period "."
