Pulmonary hypertension is a lung condition in which there is increased pressure in the pulmonary arteries that travel from the heart to the lungs. The most common symptoms are shortness of breath and fatigue. Other more severe symptoms are chest pain, palpitations, and dizziness. There is no cure for the disease, but it can be managed with medication.
either or. The definition of either or is an expression used to indicate that there are only two options or that both of two options are acceptable or equivalent. An example of either or is when you are offered either spaghetti or cereal for dinner and are different between the two so you say either or to indicate that both would work.
An antonym is a word that is the opposite in meaning of another word, so it makes sense that the opposite of careful, or being full of care, is a word that means not paying close attention, or expressing little to no care.