noun which may take the genitive case particle 'no', noun
Used as a no-adjective or noun to describe something habitual, routine, or normal. Often appears in formal expressions like 平素の努力 (one's usual efforts) or 平素の行い (one's everyday conduct).
平素の努力が実を結んだ。
His everyday efforts bore fruit.
Adverbial use meaning 'under normal circumstances' or 'as a rule'. Common in formal or written contexts, such as business letters and speeches.
平素は午前9時に出社しております。
Ordinarily, I arrive at the office at 9 a.m.
A person with good everyday conduct is trusted.
平素よりご愛顧いただき、誠にありがとうございます。
Thank you very much for your continued patronage.
平素 is a very formal, business-letter word for 'usually', while 常々 is somewhat formal but still usable in everyday reflective speech.
平素 is the very formal, business-letter equivalent of 普段, used in set phrases like 平素はお世話になっております.
Compound of 平 (flat, calm, ordinary) and 素 (element, plain). The combination conveys the idea of 'ordinary and unadorned', referring to one's usual state or everyday affairs.