English
irresistless
From ir- + resist + -less.
Formed from in + resist + less
Proto-Indo-European *h₁én ‘in’
Proto-Germanic *in
Proto-West Germanic *in
Old English in
Middle English in ‘inside’
English in
Proto-Indo-European *steh₂- ‘stand’
…
Latin sistō ‘cause to stand’
Latin resistere
Middle French resister ‘to resist’
Middle English resisten ‘to resist’
English resist
Proto-Germanic *laisiz ‘smaller, lesser’
Old English lǣs ‘smaller, less’
Middle English les
English less
Today it means
adj Irresistable.
Language periods are conventional ranges, not dates for this word.
Etymograph / irresistless