unconvincing

unconvincing — adjective

1. If an excuse, reason, or performance is unconvincing, you do not accept it as tr

1.adjectiveB2
Definition

If an excuse, reason, or performance is unconvincing, you do not accept it as true or genuine because it lacks strength, evidence, or natural quality.

Example

Rin's excuse for being late was so unconvincing that the manager asked her for proof.

unconvincing excuse — common collocation pattern

The ending of the film felt rushed and unconvincing, which disappointed many fans.

Common collocations
  • unconvincing excuse
  • unconvincing explanation
  • unconvincing argument
  • unconvincing performance
  • unconvincing smile
  • unconvincing attempt
Synonyms
  • implausible

    More formal; suggests the content itself is unlikely to be true (e.g., an implausible plot twist)

  • weak

    Less formal; suggests the reasoning or evidence has little strength (e.g., a weak argument)

  • unbelievable

    Stronger; suggests something is impossible to believe (e.g., an unbelievable alibi)

Antonyms
  • convincing

    The direct opposite; something that makes you believe it is true

  • persuasive

    Suggests strong, well-structured reasoning that wins you over

  • plausible

    Describes something that seems reasonable and likely to be true

Grammar Patterns

unconvincing + noun (excuse / explanation / argument / performance)

be / seem / sound / find + unconvincing

Usage Note

Often appears with nouns such as excuse, explanation, argument, reason, or performance as the subject. It can also modify attempt or smile to describe someone's failed effort to appear a certain way. The comparative and superlative forms are more unconvincing and most unconvincing.

Common Mistakes

His story was unconvincing to believe.
His story was unconvincing.
unconvincing already carries the meaning of 'not able to be believed,' so adding 'to believe' is redundant.
The speech was very unconvincing for me.
I found the speech very unconvincing.
English more naturally uses find + object + unconvincing without the preposition for.

Word family

Synonym discussion

Sense: adjective/1

All five words describe something that fails to persuade, but they differ in formality and connotation. Unconvincing is the most neutral and widely used — it simply means not making you believe something is true or genuine. Implausible is more formal and intellectual, often used for ideas or theories that lack probability (e.g., an implausible scientific claim). Weak is informal and suggests poor reasoning or insufficient evidence (e.g., a weak defense in a debate). Unbelievable is the strongest, implying something is so unlikely that it cannot be accepted as true (e.g., an unbelievable alibi). Far-fetched is conversational and suggests a story or idea is exaggerated or stretches the imagination too far (e.g., a far-fetched travel tale). Use unconvincing when you want a general, balanced word; choose the others when you want to emphasize a specific type of failure.

unconvincing ↗implausibleweak ↗unbelievable ↗far-fetched ↗

Common collocations

Nouns

  • unconvincing excuse
  • unconvincing explanation
  • unconvincing argument
  • unconvincing performance
  • unconvincing smile
  • unconvincing attempt

Adverbs

  • utterly unconvincing
  • completely unconvincing
  • rather unconvincing
  • somewhat unconvincing
  • totally unconvincing

Prepositions

  • unconvincing to someone

Etymology

LatinEnglish

The word unconvincing combines the prefix un- (meaning 'not') with convincing, which comes from the Latin verb convincere, meaning 'to overcome decisively' or 'to prove wrong.' Convincere itself is formed from con- ('completely, thoroughly') and vincere ('to conquer'). So unconvincing literally suggests something that cannot completely win someone over or that fails to prove its point. The word entered English use in the mid-18th century.