Having feck; spirited, lively, or having strength and effectiveness (primarily Irish and Scottish dialect).
From 'feck' (Irish/Scottish slang for effectiveness, spirit, or vitality) plus '-ful' (full of), creating an adjective meaning full of energy or effectiveness in regional dialect.
In Irish English, 'feck' is close to a mild curse word (as in 'Feck off!'), but 'feckful' actually means spirited and alive—so something feckful is energetic and worthwhile, the opposite of what 'feckless' means.
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