different between preposterous vs unconvincing

English

Alternative forms

• præposterous (archaic)

Etymology

From Latin praeposterus (“with the hinder part before, reversed, inverted, perverted”), from prae (“before”) + posterus (“coming after”).

Pronunciation

• (Received Pronunciation) IPA^(key): /p???p?st???s/, /p???p?st??s/, /p??-/
• (General American) IPA^(key): /p???p?st???s/, /p???p?st??s/

Adjective

preposterous (comparative more preposterous, superlative most preposterous)

1. Absurd, or contrary to common sense.
   • 2016 January 30, "America deserves more from presidential hopefuls," The National (retrieved 31 January 2016):

     Democrats, too, must be criticised. While they have not made preposterous statements or been threatening or demagogic, they, all too often, have come up short, failing to propose new ideas that can help unwind conflicts raging across the Middle East.

Synonyms

• absurd
• foolish
• irrational
• nonsensical
• See also Thesaurus:absurd

Translations

See also

• topsy-turvy
• upside down

Further reading

• preposterous in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• preposterous in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

English

Etymology

un- +? convincing

Adjective

unconvincing (comparative more unconvincing, superlative most unconvincing)

1. not convincing, plausible or believable

   He gave me an unconvincing explanation of the fault, but I have my doubts.

Translations

Verb

unconvincing

1. present participle of unconvince