Unless vs Therefore - What's the difference?

unless | therefore |

As a conjunction unless

is except on a specified condition; if not.

As an adverb therefore is

(conjunctive) for that or this purpose, referring to something previously stated.



Alternative forms

* unlesse (obsolete)


(English Conjunctions)
  • Except on a specified condition; if not.
  • I’m leaving unless I get a pay rise (AmE: raise).
  • *
  • * 1839 , Denison Olmsted, A Compendium of Astronomy Page 95
  • Secondly, When a body is once in motion it will continue to move forever, unless something stops it. When a ball is struck on the surface of the earth, the friction of the earth and the resistance of the air soon stop its motion.


    * (except on a condition) if

    Derived terms

    * precisely unless * unlesss * unless and until, until and unless






  • (conjunctive) For that or this purpose, referring to something previously stated.
  • *
  • I have married a wife, and therefore I can not come.
  • *
  • Behold, we have forsaken all, and followed thee; what shall we have therefore ?
  • (conjunctive) Consequently, by or in consequence of that or this cause; referring to something previously stated.
  • * , title=(Discourse on the Method)
  • , passage=Je pense, donc je suis (I think, therefore I am)}}
  • *
  • , title=(The Celebrity), chapter=1 , passage=In the old days, to my commonplace and unobserving mind, he gave no evidences of genius whatsoever. He never read me any of his manuscripts, 
  • * {{quote-magazine, year=2012, month=March-April, author=
  • , volume=100, issue=2, page=171, magazine=(American Scientist) , title= Well-connected Brains , passage=Creating a complete map of the human connectome would therefore be a monumental milestone but not the end of the journey to understanding how our brains work.}}
  • * (rfdate), Spectator
  • He blushes; therefore he is guilty.


    * (for that purpose) so, thus, to that end, to this end * (consequently) hence, then, thus, accordingly, as a result, (math)

    Derived terms


    See also