R Base plotting, how to add a bold layer to mtext?

Question

mtext("Females", outer=TRUE)

I want to make the outer title bold but I am unable to add a bold layer to it. Please help

Answer 1

like this:

x11() 
par(oma = c(0, 0, 2, 0))
plot(1)
mtext("bla", outer = T, font = 2) # font = 2 <- bold