Even more worrisome for dog owners is boredom and the lethargy and general lack of spirit dogs suffer from when they're not stimulated. (petbusiness.com)
«While we have not seen the type of large credit expansions that would be most worrisome for [Federal Reserve] officials concerned about financial imbalances, there are now some signs of speculative behavior in financial markets, e.g. the cryptocurrency boom.» (hacked.com)
They are looking for oil and the presence of polycyclic aromatic hydrocarbons, the most worrisome of toxins in oil. (sciencemag.org)