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high 
  adj 
1 elevated, lofty, soaring, steep, tall, towering 
2 excessive, extraordinary, extreme, great, intensified, sharp, strong 
3 arch, big-time  (informal) chief, consequential, distinguished, eminent, exalted, important, influential, leading, major league  (informal) notable, powerful, prominent, ruling, significant, superior 
4 arrogant, boastful, bragging, despotic, domineering, haughty, lofty, lordly, ostentatious, overbearing, proud, tyrannical, vainglorious 
5 capital, extreme, grave, important, serious 
6 boisterous, bouncy  (informal) cheerful, elated, excited, exhilarated, exuberant, joyful, light-hearted, merry, strong, tumultuous, turbulent 
7  (informal) delirious, euphoric, freaked out  (informal) hyped up  (slang) inebriated, intoxicated, on a trip  (informal) spaced out  (slang) stoned  (slang) tripping  (informal) turned on  (slang) zonked  (slang) 
8 costly, dear, exorbitant, expensive, high-priced, steep  (informal) stiff 
9 acute, high-pitched, penetrating, piercing, piping, sharp, shrill, soprano, strident, treble 
10 extravagant, grand, lavish, luxurious, rich 
11 gamey, niffy  (Brit. slang) pongy  (Brit. informal) strong-flavoured, tainted, whiffy  (Brit. slang) 
12 high and dry  abandoned, bereft, destitute, helpless, stranded 
13 high and low  all over, everywhere, exhaustively, far and wide, in every nook and cranny 
14 high and mighty   (informal) arrogant, cavalier, conceited, disdainful, haughty, imperious, overbearing, self-important, snobbish, stuck-up  (informal) superior 
  adv 
15 aloft, at great height, far up, way up 
  n 
16 apex, crest, height, peak, record level, summit, top 
17  (informal) delirium, ecstasy, euphoria, intoxication, trip  (informal) 
 
Antonyms  
 
1 dwarfed, low, short, stunted 
2 average, low, mild, moderate, reduced, restrained, routine, suppressed 
3 average, common, degraded, ignoble, inconsequential, insignificant, low, lowly, low-ranking, menial, routine, secondary, undistinguished, unimportant 
6 angry, dejected, depressed, gloomy, low, melancholy, sad 
9 alto, bass, deep, gruff, low, low-pitched 


"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"