Adjectives, Nouns, and Verbs That Start With -ous

This guide covers words that end with the suffix -ous, organized by their part of speech: adjectives, nouns, and verbs. You will learn how to use these words correctly in writing, email, and everyday conversation, with clear examples and common mistake notes.

Adjectives Ending in -ous (Most Common)

The majority of -ous words are adjectives. They describe a person, thing, or situation. Here are the most practical ones for daily use.

Common -ous Adjectives

• Dangerous – likely to cause harm. Example: The road is dangerous at night.
• Famous – known by many people. Example: She is a famous singer.
• Serious – important or not joking. Example: This is a serious problem.
• Curious – wanting to learn or know. Example: The child was curious about the stars.
• Generous – willing to give or share. Example: He made a generous donation.
• Nervous – worried or afraid. Example: I feel nervous before exams.
• Obvious – easy to see or understand. Example: The answer was obvious.
• Previous – happening before. Example: In the previous meeting, we discussed this.
• Various – different types. Example: The store sells various items.
• Enormous – very large. Example: They live in an enormous house.

Formal vs. Informal Tone

Most -ous adjectives are neutral and work in both formal and informal contexts. However, some are more common in formal writing.

Natural Examples

• Email context: “Thank you for your generous offer. I will consider it carefully.”
• Conversation context: “I’m nervous about the interview tomorrow.”
• Writing context: “The previous chapter explained the basics.”

Common Mistakes

• Mistake: Using curious to mean “strange.” Correction: Curious means “interested,” not “odd.” Use strange or odd for that meaning.
• Mistake: Confusing serious with sincere. Correction: Serious means important or not joking. Sincere means honest or genuine.
• Mistake: Overusing obvious in polite conversation. Correction: Saying “It’s obvious” can sound rude. Use “It is clear” or “It seems” instead.

Better Alternatives

When you want to avoid overused -ous adjectives, try these alternatives.

• Instead of dangerous, use risky or hazardous (more formal).
• Instead of famous, use well-known or renowned (more formal).
• Instead of nervous, use anxious (more formal) or worried (more common).

Nouns Ending in -ous (Less Common)

Only a few nouns end in -ous. They are often borrowed from French or Latin. Here are the most useful ones.

Common -ous Nouns

• Fame – being known by many. Note: The adjective is famous, but the noun is fame.
• Curiosity – the desire to learn. Note: The adjective is curious, but the noun is curiosity.
• Generosity – the quality of being generous. Note: The adjective is generous, but the noun is generosity.
• Nervousness – the state of being nervous. Example: His nervousness was obvious.
• Seriousness – the quality of being serious. Example: The seriousness of the situation was clear.

When to Use It

Use these nouns in formal writing or when you need a precise term. In everyday conversation, you can often use the adjective form instead.

• Formal: “The seriousness of the issue cannot be overstated.”
• Informal: “This is really serious.”

Common Mistakes

• Mistake: Using famous as a noun. Correction: Famous is an adjective. The noun is fame.
• Mistake: Using curious as a noun. Correction: Curious is an adjective. The noun is curiosity.

Verbs Ending in -ous (Rare)

Very few verbs end in -ous. Most are not common in everyday English. Here are the only ones you might encounter.

Common -ous Verbs

• Vouch – to guarantee or support. Example: I can vouch for his honesty.
• Bivouac – to camp without a tent. Example: They bivouacked on the mountain.

When to Use It

Vouch is useful in formal and informal contexts. Bivouac is only used in outdoor or military contexts.

• Email context: “I can vouch for her experience.”
• Conversation context: “I’ll vouch for you if needed.”

Common Mistakes

• Mistake: Using vouch without for. Correction: Always say vouch for someone or something.
• Mistake: Confusing bivouac with camp. Correction: Bivouac means a temporary camp without shelter.

Comparison Table: Adjectives, Nouns, and Verbs

Mini Practice: Test Yourself

Choose the correct word to complete each sentence.

1. The situation is very ______. (dangerous / danger)
2. She felt ______ before the speech. (nervousness / nervous)
3. I can ______ for his character. (vouch / vouch for)
4. His ______ was obvious to everyone. (curious / curiosity)

Answers

1. dangerous (adjective)
2. nervous (adjective)
3. vouch for (verb + preposition)
4. curiosity (noun)

FAQ: Common Questions About -ous Words

1. Are all -ous words adjectives?

No, but most are. A small number of nouns and verbs also end in -ous, but they are less common. Focus on learning the adjectives first.

2. How do I know if a word is an adjective or a noun?

Look at the ending. If the word ends in -ous and describes something, it is an adjective. If it ends in -ness or -ity, it is often a noun. For example, curious (adjective) vs. curiosity (noun).

3. Can I use -ous words in formal writing?

Yes, most -ous adjectives are neutral and work well in formal writing. Words like serious, obvious, and generous are common in business and academic contexts.

4. What is the most common mistake with -ous words?

The most common mistake is using the adjective form when a noun is needed. For example, saying “He has a curious” instead of “He has curiosity.” Always check if you need an adjective or a noun.

Final Tips for Learners

To master -ous words, practice using them in sentences. Start with the adjectives listed here, then move to the nouns and verbs. Pay attention to context: use curious for interest, not for strangeness. For more word lists, visit our Parts of Speech Lists or explore Beginner Word Lists for simpler terms. If you have questions, check our FAQ or contact us.