Fusawashii

相応しい [ふさわしい] – appropriate

  • 相 [ソウ・あい] – mutual; together
  • 応 [オウ・あたる] – apply; answer
  • しい – adjectival ending

Something that mutually-applies is “appropriate.”  If something is inappropriate, you can express that by changing しい to しくない (e.g. 相応しくない).  If you want to turn it into an adverb, change しい to しく, and affix a verb.

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