r/Neologisms

I’ve been trying to find a precise linguistic way to describe the profound sense of alienation or "wrongness" that comes with national or cultural dysphoria—that specific ache of feeling like an absolute foreigner in your own birth country or native culture.
Since standard English lacks a clean word for this, I started adapting a concept from evolutionary biology, splitting it into a clean noun and adjective framework:
Allopatrid (noun): A person experiencing cultural or national dysphoria; someone who feels profoundly alienated from, or ideologically mismatched with, their geographic homeland. (From the Greek allos meaning "other" and patra meaning "fatherland").
Allopatric (adjective): Describing the actual state or feeling of this geographic and cultural mismatch.
In biology, an allopatric species is one isolated by a physical barrier (like a mountain or ocean), causing it to evolve completely separately from its original group.
Applying this metaphorically to human psychology feels incredibly accurate. When your home country shifts ideologically, or when you realize your internal values simply do not align with the geography you were born into, you become an allopatrid. You are physically present, but culturally isolated by an invisible barrier.
Example noun: "Despite living there for decades, the shifting societal values made him feel like an allopatrid."
Example adjective: "She felt a deep, allopatric disconnect every time she tried to participate in local traditions."
Curious to know if this concept resonates with anyone else who experiences cultural dysphoria, or if anyone has encountered similar terms?

Posteritous — adj. undertaken with regard for future generations

I recently came across a coined word that feels like it should already exist:

posteritous (adj.) — undertaken with regard for the welfare, interests, or judgment of future generations; intended to benefit posterity.

Examples:

“A posteritous act may benefit people who will never know your name.”

“Building institutions that still work a century from now is a posteritous project.”

Formation is pretty straightforward: posterity + -ous.

I’m interested in whether this actually fills a lexical gap, or whether there’s already a better English word doing the same work.