Source : Webster's Revised Unabridged Dictionary (1913)

Unstrained \Un*strained"\, a. [Pref. un- not + strain.]
   1. Not strained; not cleared or purified by straining; as,
      unstrained oil or milk.

   2. Not forced; easy; natural; as, a unstrained deduction or
      inference. --Hakewill.

Source : WordNet®

unstrained
     adj 1: not placed under psychological stress; "the campaign would
            not leave party loyalties unstrained"
     2: not processed by putting through a strainer; "unstrained
        home-style orange juice"
     3: not resulting from undue effort; not forced; "a voice with a
        pleasingly unforced quality"; "his playing is facile and
        unstrained" [syn: {unforced}]