threatful

From threat +‎ -ful.

• (Received Pronunciation) IPA^(key): /ˈθɹɛtfəl/

threatful (comparative more threatful, superlative most threatful)

1. Threatening.
   • 1590, Edmund Spenser, “Book II, Canto XII”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie, →OCLC:

     Then he with all his puissance doth striue / To strike his oares, and mightily doth driue / The hollow vessell through the threatfull waue […]

• threatfully
• threatfulness