Rarely 504 Absolutely Essential Words Lesson 23
/ˈreə.li/ (adv)
not usual, very uncommon, not often, seldom, scarcely, infrequently, occasionally, once in a blue moon, hardly, barely, once in a while, hardly ever
The congenital diaphragmatic hernia (CDH) is an abnormality that rarely occurs with an approximate ratio of one in 3000 live births. It has been reported that 85% of the infants affected by this condition are left-sided and the classic posterolateral or Bochdalek hernia is the most common form.
Source: https://ijn.mums.ac.ir/
Antonym: often
Noun: rarity
Adjective: rare