courtesy
慇 centers on sincere, heartfelt courtesy: a deep politeness that comes from genuine care and respect.
慇 combines 殷 (which historically relates to abundance or fullness) with 心 (heart), suggesting a heart full of sincere feeling, leading to the idea of deep courtesy.
The top part 殷 suggests richness or fullness, and the bottom 心 is the heart. Picture a heart so full of genuine respect that it overflows into courteous, polite behavior.
For イン, imagine an innkeeper whose heartfelt courtesy makes every guest feel welcome: inn -> イン, and the innkeeper's heart (心) is full of sincere politeness.
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superficially polite but actually rude; rude under a veneer of politeness; courteous on the surface but insolent at heart
polite; courteous; civil
to have a surreptitious sexual relationship with; to have an illicit love affair with
polite and courteous
overdone politeness; polite to a fault; feigned politeness