high has 15 distinct synonyms spread across 10 of its 18 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 2 recorded opposites are low, low spirits.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
an air mass of higher than normal pressure
“the east coast benefits from a Bermuda high”
a state of sustained elation
“I'm on a permanent high these days”
a state of altered consciousness induced by alcohol or narcotics
“they took drugs to get a high on”
a high place
“they stood on high and observed the countryside”
a public secondary school usually including grades 9 through 12
“he goes to the neighborhood highschool”
greater than normal in degree or intensity or amount
“a high temperature”
(literal meaning) being at or having a relatively great or specific elevation or upward extension (sometimes used in combinations like `knee-high')
“a high mountain”
2 of the 18 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for high.
Synonyms, antonyms and the broader and narrower relations for high come from Princeton University’s WordNet. Full sources and licences.
used of sounds and voices; high in pitch or frequency
happy and excited and energetic
slightly and pleasantly intoxicated from alcohol or a drug (especially marijuana)