noun
sense of decorum; awareness of common courtesy
Refers to an innate or cultivated sensitivity to proper manners and everyday social courtesies.
彼は礼儀感覚に欠けている。
He lacks a sense of decorum.
社会人として最低限の礼儀感覚は身につけるべきだ。
As a working adult, you should acquire at least a basic sense of common courtesy.
Compound of 礼儀 (courtesy, manners) and 感覚 (sense, sensation). The exact historical derivation is uncertain, but the word transparently combines these elements.