Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun hadean

1 sense of hadean

Sense 1
Hadean, Hadean time, Hadean eon, Hadean aeon, Priscoan, Priscoan eon, Priscoan aeon -- (the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life)
       INSTANCE OF=> eon, aeon -- (the longest division of geological time)

Antonyms of adj hadean

1 sense of hadean

Sense 1
Hadean, Plutonian, Tartarean -- (of or relating to or characteristic of Hades or Tartarus)

INDIRECT (VIA infernal) -> supernal -- (being or coming from on high; "interpret the plague as a visitation from heaven, a supernal punishment for the sins of men")

Similarity of adj hadean

1 sense of hadean

Sense 1
Hadean, Plutonian, Tartarean -- (of or relating to or characteristic of Hades or Tartarus)
       => infernal (vs. supernal) -- (being of the underworld; "infernal regions")