Definition of unpreventably in US English:

unpreventably

adverb

  • In an unpreventable manner; unavoidably, inevitably.

Origin

Mid 17th century; earliest use found in William Whately (1583–1639), Church of England clergyman and puritan preacher. From unpreventable + -ly.

Pronunciation

unpreventably

/ˌʌnprɪˈvɛntəbli/