valid
/ˈvælɪd/
ADJECTIVE
1. Well grounded or justifiable
Having a sound basis, being reasonable, defensible, or supported by sufficient evidence or justification.
1.1. Reasonable and well-founded
Based on sound reasoning, facts, or evidence; capable of being defended or justified as reasonable and convincing.
Synonyms
- cogent
- convincing
- defendable
- defensible
- justifiable
- justified
- logical
- plausible
- rational
- reasonable
- reasoned
- sound
- supportable
- tenable
- well-founded
- well-grounded
Antonyms
- absurd
- fallacious
- false
- groundless
- illogical
- implausible
- irrational
- unfounded
- unjustified
- unreasonable
- unsound
- unsubstantiated
- unsupported
- unwarranted
- wrong
Examples
- The judge declared the evidence inadmissible as it lacked a valid chain of custody.
Related Words
ADJECTIVE
2. Acceptable, proper or correct
Acceptable, proper, or correct; in accordance with established rules, requirements, or legal standards.
2.1. Legally acceptable and binding
Recognized by law or official requirements as legitimate, lawful, enforceable, or legally effective.
Synonyms
- binding
- in force
- lawful
- legal
- legit
- legitimate
- official
Antonyms
- illegal
- illegitimate
- illicit
- unlawful
- invalid
- nonvalid
Examples
- The contract is legally binding only if all parties provide their valid signatures.
Related Words
- accepted
- approved
- certified
- endorsed
- guaranteed
- sanctioned
- upheld
2.2. Proper and acceptable under rules
Meeting established conditions or requirements and being accepted as suitable, correct, or officially usable.
Synonyms
- acceptable
- certified
- confirmed
- good
- legitimate
- official
- true
- verified
Antonyms
- counterfeit
- fake
- illegal
- illegitimate
- unacceptable
- unreliable
- untrustworthy
- wrong
Examples
- Only with a valid ticket can you enter the concert venue.
- Please present a valid ID when checking in at the airport.
Related Words
- accepted
- admitted
- allowed
- approved
- authenticated
- authorized
- identified
- recognized
ADJECTIVE
3. Related to the current topic or relevant
Related to the current topic, or presented within context; relevant.
3.1. Relevant and pertinent to a subject
Directly connected with the subject or situation being discussed and appropriate to the context.
Synonyms
- apposite
- pertinent
- relevant
Antonyms
- irrelevant
- inapplicable
- inappropriate
- unrelated
Related Words
- associated
- connected
- corresponding
- related
- specific
ADJECTIVE
4. Logically true regardless of input values
Of a formula or system: such that it evaluates to true regardless of the input values.
4.1. Analytically or logically true
Describing a formula or logical expression whose truth remains established regardless of the values assigned to its inputs.
Synonyms
- analytic
- analytical
- logical
- syllogistic
Antonyms
- illogical
- irrational
- nonsensical
- nonvalid
Related Words
ADJECTIVE
5. Logically sound argument
Of an argument: whose conclusion is always true whenever its premises are true.
5.1. Deductively correct reasoning
Describing an argument in which the conclusion necessarily follows from its premises, so that true premises guarantee a true conclusion.
Synonyms
Antonyms
- fallacious
- illogical
- incoherent
- inconsequent
- irrational
- specious
- unsound
Examples
- The scientist emphasized the importance of conducting experiments with valid methodologies.
Related Words
- a priori
- analytic
- coherent
- convincing
- irrefutable
- rational
- well-founded
ADJECTIVE
6. Effective
Producing the intended result or being capable of achieving a desired effect.
6.1. Effective and capable of producing results
Having the ability to work successfully, achieve an intended purpose, or produce the desired effect.
Synonyms
- efficacious
- effective
- effectual
- efficient
- potent
- powerful
- productive
- usable
- useful
- workable
Antonyms
- ineffective
- ineffectual
- useless
- unworkable
Related Words
- accomplished
- adequate
- capable
- competent
- feasible
- functional
- practical
- proficient