Meaning & Definition of Ruinous in English

1. Extremely harmful

• Bringing physical or financial ruin

• "A catastrophic depression"

• "Catastrophic illness"

• "A ruinous course of action"

2. Causing injury or blight

• Especially affecting with sudden violence or plague or ruin

• "The blasting effects of the intense cold on the budding fruit"

• "The blasting force of the wind blowing sharp needles of sleet in our faces"

• "A ruinous war"