untamed (adj.)

• animal
• atrocious
• barbarian
• barbaric
• barbarous
• bestial
• bloody
• brutal
• brutish
• feral
• ferine
• ferocious
• fierce
• ill-bred
• impolite
• inhuman
• malign
• malignant
• merciless
• murderous
• noncivilized
• outlandish
• pitiless
• primitive
• rough-and-ready
• ruthless
• sanguinary
• savage
• unbroken
• uncivil
• uncivilized
• uncombed
• unconquered
• uncontrollable
• uncouth
• uncultivated
• uncultured
• undomesticated
• ungentle
• ungoverned
• unkempt
• unpolished
• unrefined
• unsubdued
• unvanquished
• vicious
• wild