invalid - Master This Word
Master this word with our 5-step learning method – Learn English in English
invalid Word Meanings
- not valid or acceptable
- not legitimate or appropriate
- a person with invalid status
invalid Example Sentences
Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.
invalid Phonetic & Pronunciation
UK
/ɪnˈvælɪd/
US
/ɪnˈvælɪd/
invalid Word Etymology
Root decomposition: 'in-' (not) + 'valid' (strong, powerful). Historical origin: Latin 'invalidus' → Old French 'invalid' → English. Memory image: Picture a rubber stamp refusing to validate a document, symbolizing lack of legitimacy.
Note 1: These definitions and etymologies are not standard dictionary definitions, but extended explanations provided to help with memorization and understanding of the actual application of words. Through this background information, we strive to make words more vivid and easier to understand, and help you remember their meanings in real life.
Note 2: LexiTalk designs the learning flow around the linguistics principle of “Comprehensible Input.” When learners encounter material that is slightly above their level but still understandable from context, the brain naturally absorbs the language. That’s why we keep every word inside authentic contexts, using examples and associations to help you understand it and use it flexibly.
Read the FAQ explanation of Comprehensible InputReal Context
Invalid means not valid or acceptable, not legitimate or appropriate, or a person with invalid status in older usage. In everyday English we use it for things that fail to meet rules or standards, such as an invalid password, an invalid contract, or an invalid argument. The word is more common as an adjective describing objects, rules, or decisions that do not hold up under scrutiny. When used as a noun, an invalid can refer to a disabled person, but this usage is now considered outdated or offensive by some speakers, so modern language prefers disabled person or person with a disability. The negative prefix in- signals the opposite of valid, which helps learners recognize related words like valid, validity, and evaluate.
Usage Reminders
- Know the two main senses of invalid: not valid and not legitimate; avoid using it for people; practice with common collocations; distinguish from inactive or invalidated; prefer neutral terms for people; review related words like valid and validity.
Common Misconceptions
- Invalid only means not valid for documents.
- The noun sense is the same as the adjective, always.
- It is a direct synonym of illegitimate.
- It can be used to describe opinions or arguments freely.
- It is a verb.
Thinking Differences
English learners often rely on the literal negation of valid, but in many contexts invalid collocates with technical terms in law or tech; avoid confusing this with weak or worthless, which are separate ideas.
Learning Tips
- Practice the two senses separately: not valid vs not legitimate.
- Note that the noun sense referring to a person is outdated and often inappropriate.
- Pair with common collocations like invalid password, invalid contract.
- Compare with the opposite: valid and validity to build contrasts.
- Avoid using invalid as a belief or opinion; use a neutral term for people.
- Review related forms: validity, value, evaluate.
5-Step Learning Method - Learn English in English
Step 1: Meaning
Step 2: Usage
Choose the correct usage of the word 'invalid' in a sentence.
A.The argument was deemed invalid due to lack of evidence.
B.I feel invalid about my decision.
C.She invalid her ticket at the entrance.
D.His feelings were invalid in the discussion.
Step 3: Similar Words
Which word is most similar to 'invalid'?
A.void
B.confirmed
C.supported
D.secure
Step 4: Opposite Words
What is the opposite of the word 'invalid'?
A.incorrect
B.legal
C.false
D.deceptive
Step 5: Mastery
Can you think of a real-life situation where something could be described as invalid?
A.A postage stamp that has expired.
B.A winning lottery ticket.
C.A signed contract that is enforceable.
D.A new law that protects citizens.
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