The Collaborative International Dictionary of English v.0.48:

Lifelike \Life"like`\ (l[imac]f"l[imac]k`), a. [Cf. Lively.]
   Like a living being; resembling life; giving an accurate
   representation; as, a lifelike portrait. -- Life"like`ness,
   n. --Poe.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lifelike
    adj 1: evoking lifelike images within the mind; "pictorial
           poetry and prose"; "graphic accounts of battle"; "a
           lifelike portrait"; "a vivid description" [syn:
           graphic, lifelike, pictorial, vivid]
    2: free from artificiality; "a lifelike pose"; "a natural
       reaction" [syn: lifelike, natural]

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "lifelike":
   authentic, bona fide, breathing, candid, card-carrying,
   delineative, depictive, descriptive, dinkum, expositive,
   expressive, faithful, following the letter, genuine, good, graphic,
   honest, honest-to-God, inartificial, lawful, legitimate, literal,
   living, natural, naturalistic, original, pure, real, realistic,
   representative, rightful, simon-pure, simple, sincere, speaking,
   sterling, sure-enough, to the life, true to life, true to nature,
   true to reality, unadulterated, unaffected, unassumed, unassuming,
   uncolored, unconcocted, uncopied, uncounterfeited, undisguised,
   undisguising, undistorted, unexaggerated, unfabricated, unfanciful,
   unfeigned, unfeigning, unfictitious, unflattering, unimagined,
   unimitated, uninvented, unpretended, unpretending, unqualified,
   unromantic, unsimulated, unspecious, unsynthetic, unvarnished,
   verbal, verbatim, veridical, verisimilar, vivid, well-drawn,
   word-for-word