Archaic sense for unreasonable or absurd actions or thoughts.
One must not enter another's land without good reason.
Reckless behavior should be avoided.
In old texts, there are admonitions against loose conduct.
Do not be led astray by irrational thoughts.
みだり is a more formal/legal word for acting without proper authorization or reason, often in phrases like みだりに立ち入るべからず, whereas むやみ is broader and more common in everyday speech.
cold; common cold
Archaic kanji spelling; the word is now normally written in kana as みだり.
Modern kana spelling; the kanji forms are archaic and rarely used.
Archaic kanji spelling.
Archaic kanji spelling.
Archaic kanji spelling.
Archaic kanji spelling.
The word is archaic and its exact derivation is uncertain. It may be related to the stem of 乱れる (みだれる, 'to be disordered'), but the historical connection is not firmly established.