1. 
2. 
[syn: unforced, unstrained]
The Collaborative International Dictionary of English v.0.48:
Unstrained \Un*strained"\, a. [Pref. un- not + strain.]
   1. Not strained; not cleared or purified by straining; as,
      unstrained oil or milk.
      [1913 Webster]
   2. Not forced; easy; natural; as, a unstrained deduction or
      inference. --Hakewill.
      [1913 Webster]
WordNet (r) 3.0 (2006):
unstrained
    adj 1: not placed under psychological stress; "the campaign
           would not leave party loyalties unstrained"
    2: not resulting from undue effort; not forced; "a voice with a
       pleasingly unforced quality"; "his playing is facile and
       unstrained" [syn: unforced, unstrained]
Moby Thesaurus II by Grady Ward, 1.0:
23 Moby Thesaurus words for "unstrained":
   calm, coolheaded, inexcitable, nerveless, relaxed, rock-steady,
   steady, steady-handed, steady-nerved, steel-nerved, strong-nerved,
   unblenching, unblinking, unfaltering, unflinching, unnervous,
   unquivering, unshaken, unshaky, unshrinking, untremulous,
   unwavering, without a tremor