сопля́чка

rare #23895nounfeminineanimatecountable

1.
snot-nosed girl, brat, greenhorn (female)
Молчи́, сопля́чка, тебя́ никто́ не спра́шивал!
Be quiet, you snot-nosed brat, nobody asked you!
Colloquial and derogatory; feminine of сопляк, said of a girl or young woman regarded as too young to be taken seriously.
2.
sniveller, milksop, spineless creature, wimp
Не будь сопля́чкой, переста́нь хны́кать!
Don't be such a wimp, stop whining!
Colloquial and derogatory, of a female.

Examples

Эта соплячка постоянно ноет из-за мелочей.
That crybaby is always whining about little things.
Соплячка расплакалась при первой же трудности.
The crybaby burst into tears at the first difficulty.
Не веди себя как соплячка, будь смелее.
Don't act like a crybaby—be braver.