Adjective scarce has 2 senses
  1. scarce - not enough; hard to find; "meat was scarce during the war"
    sufficient (indirect, via insufficient)
  2. scarce - deficient in quantity or number compared with the demand; "fresh vegetables were scarce during the drought"
    abundant, abounding, galore, ample, plenteous, rich, bumper, copious, extensive, voluminous, easy, thick, long, overabundant, plethoric, rife, plentiful, superabundant, teeming, swarming, torrential, verdant, well endowed, exuberant, lush, luxuriant, profuse, riotous, rank
,Adverbial scarce has 1 sense
  1. barely, hardly, just, scarcely, scarce - by a small margin; "they could barely hear the speaker"; "we hardly knew them"; "just missed being hit"; "had scarcely rung the bell when the door flew open"; "would have scarce arrived before she would have found some excuse to leave"- W.B.Yeats