Hangul syllable Neuc

It means a sign of what is likely to happen, usually for the worse. Think omen, warning sign, or poor prospects—not the everyday Korean word 늦 (“late”). In Korean, 늧 names an early clue that lets you foresee an outcome. Examples usually lean negative: 늧이 사납다 means the signs look bad, while 그 사람은 늧이 글렀다 judges a person's prospects poor.

A 1447 passage in 용비어천가, a Joseon royal-praise work tied to dynastic succession and legitimacy, uses the related form 느지르샷다. It describes an omen that the realm would settle or a royal accession would come. Korean explanations also use the omen idea for plans and people. 늘품 is its positive counterpart, pointing to good future potential.

Someone sent me 늧—what are they implying?

They mean a bad sign or poor prospects. Read it as a forecast about an event, plan, or person's outlook. Alone, it leaves the thing being forecast unstated, so ask what they mean.

늧 is marked native Korean vocabulary, not a word to assume every reader will recognize. Readers familiar with older vocabulary or the proverb may know it; others may see an unexplained Hangul syllable. Use a full sentence when the forecast needs to be clear.