| 珍しい | Unusual. $$$ |
| まれ | Also means unusual, but more formal/newspapery. Also has the connotation of rare-because-it’s-valuable (endangered species, a rare talent, etc.) If you see a dog-turd shaped like Lyle Lovett, that’s 珍しい, not まれ。 |
| 希少な | Rare animals or plants. academic word. NP |
| 妙に | unusual and strange! Usually used about behavior. Something strange is going on, I can feel it! She’s acting strange today. That homeless guy is acting weird. |
KANJIDAMAGE