ef-ih-KAY-shus
(adjective) Effective in producing the desired result.
The vaccine proved highly efficacious in preventing disease.
Fun Fact
While “effective” and “efficacious” are similar, the latter is usually used in formal, academic, or scientific contexts. For instance, in pharmaceutical trials, a drug must be “efficacious” before it can be deemed “effective” for general use. It’s a favorite in public health and policy.
NEB-yuh-lus
(adjective) Unclear, vague, or ill-defined; resembling a cloud or haze.
His plans for the future remained nebulous, more dream than direction.
From Latin nebula, meaning “mist” or “cloud.”
Fun Fact
In astronomy, a nebula is a massive cloud of gas and dust in space where stars are born. The figurative meaning of nebulous—something vague or hard to see clearly—came later, borrowing that same sense of hazy uncertainty. Interestingly, in both uses, something nebulous often signals potential rather than absence; after all, every star begins as a blur in the dark.
Today's Word Salubrious suh-LOO-bree-us Definition (adjective) Health-giving; promoting well-being. Example...
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