-mans

Suffix

UK morpheme obsolete

(obsolete, UK, thieves' cant) Appended to adjectives to form nouns meaning "the state of being (the adjective)", "the quality of being (the adjective)", or "the measure of being (the adjective)".

Japanese Meaning

形容詞に付加して、その形容詞が示す「状態」すなわち『〜である状態』を表す（例：存在状態）接尾辞。 / 形容詞に付加して、その形容詞が持つ『性質』や『特質』を名詞化する接尾辞。 / 形容詞に付加して、その形容詞が示す『程度』や『尺度』を表す名詞に変える接尾辞。

What is this buttons?

In old thieves' cant, quiet-mans referred to the quality of being unobtrusive during a job.

Google Translation / DeepL Translation

昔の盗賊の隠語では、「静かさ」は仕事中に目立たないこと、すなわち目立たない性質を指した。

Details

Sense（1）

(obsolete, UK, thieves' cant) Appended to adjectives to form nouns meaning "the state of being (the adjective)", "the quality of being (the adjective)", or "the measure of being (the adjective)".