English
fecklessly
From feckless + -ly.
A compound of feckless + -ly
Latin effectus
…
Middle English effect
Early Scots fek
Scots feck ‘value’
Scots feckless ‘ineffective’
English feckless
Today it means
adv In a feckless manner.
Language periods are conventional ranges, not dates for this word.
Etymograph / fecklessly