From Longman Dictionary of Contemporary Englishtremuloustrem‧u‧lous /ˈtremjələs/ adjective literary SHAKEshaking slightly, especially because you are nervous a tremulous voice —tremulously adverb
Examples from the Corpus
tremulous• Turning to leave he saw a jiffy-bag of formidable bulk addressed to himself in Sixsmith's tremulous hand.• The bride spoke her vows with tremulous modesty.• I smile at his tremulous respect mixed with greediness.• With a brief, tremulous smile at Melissa, she trailed meekly behind him.• If so, you are taking your own first tremulous steps into fiction.Origin tremulous (1600-1700) Latin tremulus; → TREMBLE 