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Synonyms for Worrisome (same or very similar meaning)

WordNet sense 1 (causing distress or worry or anxiety):
distressful, distressing, disturbing, perturbing, troubling, worrying

WordNet sense 2 (marked by great psychological weight; weighted down especially with sadness or troubles or weariness):

WordNet sense 3 (not reassuring; tending to cause anxiety):

From the ODE community, based on WordNetadd/edit