different between troubled vs tremulous

English

troubled (comparative more troubled, superlative most troubled)

anxious, worried, careworn.
- Thanks to that penny he had just spent so recklessly [on a newspaper] he would pass a happy hour, taken, for once, out of his anxious, despondent, miserable self. It irritated him shrewdly to know that these moments of respite from carking care would not be shared with his poor wife, with careworn, troubled Ellen.

troubled

From Latin tremulus, from trem? (“I shake”). Cognate to Ancient Greek ????? (trém?).

tremulous (comparative more tremulous, superlative most tremulous)

Trembling, quivering, or shaking.
Timid, hesitant; lacking confidence.
- 2009 Oct. 7, Christopher Kimball, "Opinion: Gourmet to All That," New York Times (retrieved 18 Aug 2012):
  This, hard on the heels of the death of Julia Child in 2004, makes one tremulous about the future.

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