uncommonness

WordReference Random House Learner's Dictionary of American English © 2025

un•com•mon /ʌnˈkɑmən/   adj., -er, -est. 

1. not common;
   unusual;
   rare.
2. more than the usual in amount or degree.
3. exceptional;
   outstanding.

un•com•mon•ly, adv.: 

an uncommonly good student.

WordReference Random House Unabridged Dictionary of American English © 2025

un•com•mon  (un kom′ən), adj., -er, -est. 

1. not common;
   unusual;
   rare:
   an uncommon word.
2. unusual in amount or degree;
   above the ordinary:
   an uncommon amount of mail.
3. exceptional;
   remarkable.

• un-¹ + common 1540–50

un•com′mon•ness, n. 
Synonyms

• 1. scarce, infrequent; odd, singular, strange, peculiar, queer.
• 2. extraordinary.
• 3. outstanding.