Where does “fail-deadly” come from?

fail-deadly (English) comes from English deadly, from English -ness, from Middle English -nesse, from Old English -nes, from Proto-West Germanic -nassī, from Proto-Germanic -inassuz, from Proto-West Germanic -ī, from Proto-Germanic -į̄ — Creates collective nouns, which refer to groups...

fail-deadly (English): In nuclear weapons strategy: encouraging...

Definitions

  1. In nuclear weapons strategy: encouraging...

Ancestry of “fail-deadly”, step by step

fail-deadly traces back through two separate lines of ancestry.

via English deadly

StepLanguageWordMeaning
1EnglishdeadlySubject to death; mortal; Causing death; lethal;...
2English-nessAppended to adjectives to form nouns meaning "the...
3Middle English-nesseAffixed to adjectives to form abstract nouns...
4Old English-nesUsed to form abstract nouns, usually from...
5Proto-West Germanic-nassīUsed to form abstract nouns, usually from...
6Proto-Germanic-inassuz-ness
7Proto-West Germanic-ness, -th
8Proto-Germanic-į̄-th
9Proto-Indo-European-íh₂
10Proto-Indo-European-h₂Creates collective nouns, which refer to groups...

via English fail

StepLanguageWordMeaning
1EnglishfailTo be unsuccessful; Not to achieve a particular...
2Middle Englishfailen
3Anglo-Normanfailliralternative infinitive of falir; to fail, err
4Vulgar Latinfallire
5Latinfallōto deceive, beguile, trick, cheat, delude, ensnare, disappoint
6Proto-Indo-Europeanǵʰwel-to bend; to lie, deceive
Every word from Proto-Indo-European -h₂