The Collaborative International Dictionary of English v.0.48:

Sylphlike \Sylph"like`\, a.
   Like a sylph; airy; graceful.
   [1913 Webster]

         Sometimes a dance . . .
         Displayed some sylphlike figures in its maze. --Byron.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sylphlike
    adj 1: moving and bending with ease [syn: lissome, lissom,
           lithe, lithesome, slender, supple, svelte,
           sylphlike]