rarer

/R EH1 R ER0/
adjective
  1. 1

    Very uncommon; scarce.

    โ€œBlack pearls are very rare and therefore very valuable.โ€

  2. 2

    (of a gas) Thin; of low density.

  3. 3

    Good; enjoyable.

adjective
  1. 1

    (particularly meats) Cooked very lightly, so the meat is still red (in the case of steak or beef in the general sense).

Antonyms

Source: https://en.wiktionary.org/wiki/rare, https://en.wiktionary.org/wiki/rarer