Nouns ending in -aille are usually feminine.
Is racaille masculine or feminine?
laracaille
The rule behind it
95.8% of -aille nouns are feminine
In context
Ils les traitèrent de racailles.
They called them scalawags.
Ils les traitèrent de racailles.
They called them scalawags.
FrenchTextbook teaches rules like this, in a full beginner course.
162 lessons, 4,000+ exercises, and 6+ hours of audio.
Try the first lesson free