Quiet and slow-moving. In woods country, I'll take a few slow steps and lean up against a tree and watch for a bit. Parallel a trail, but not walk in it. If I can see into a clearing, I'll sit and watch the edges.
Deer seem alert to vertical moving objects, moreso than horizontal. If I'm forced to move across an open area, I'll bend over and move slow. But I can't do that for very long, so it's mostly stay in or near brush and just move slowly without jerky motions.
And don't move with any rhythm. Not even deer are totally silent. Step, pause; step, step, pause...Think "Fit In".
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