tremulous

Etymology

From Latin tremulus, from tremō (“I shake”). Cognate to Ancient Greek τρέμω (trémō).

adj

1. Trembling, quivering, or shaking.
   "Thank God!" he cried brokenly, all the pent emotion of the long night vibrant in his tremulous voice. 1919, William MacLeod Raine, chapter 27, in A Man Four-Square
   Light filtered in through the blinds of the french windows. It made tremulous stripes along the scrubbed pine floor. 1956, Delano Ames, chapter 12, in Crime out of Mind
2. Timid, hesitant; lacking confidence.
   "You have lived here long?" Felix asked, with tremulous interest, as he took a seat. 1891, Grant Allen, chapter 15, in The Great Taboo
   This, hard on the heels of the death of Julia Child in 2004, makes one tremulous about the future. Oct 7 2009, Christopher Kimball, “Opinion: Gourmet to All That”, in New York Times, retrieved 2012-08-18