The meaning of RUINOUS is dilapidated, ruined. How to use ruinous in a sentence.

Add to word list causing permanent and severe harm: ruinous costs (Definition of ruinous from the Cambridge Academic Content Dictionary © Cambridge University Press)

Sep 23, 2025 · ruinous (comparative more ruinous, superlative most ruinous) Causing ruin; destructive, calamitous. They were forced to completely replace the roof at ruinous expense.

1. Causing or apt to cause ruin; destructive: a ruinous habit; a ruinous rivalry. 2. Falling to ruin; dilapidated or decayed.

Definition of ruinous adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

There are six meanings listed in OED's entry for the adjective ruinous, two of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

RUINOUS definition: bringing or tending to bring ruin; destructive; disastrous. See examples of ruinous used in a sentence.

Ruinous definition: Causing or apt to cause ruin; destructive.

Ruinous refers to something that causes or may cause serious harm, damage, destruction, or great financial loss. It is often used to describe actions, decisions, or factors that lead to devastation, …

A ruinous process or course of action is one that is likely to lead to ruin. The economy of the state is experiencing the ruinous effects of the conflict.