Antonyms of scant :
sufficient, adequate, enough, satisfactory, tolerable, fat, fecund, fertile, fruitful, prolific, rich, lavish, luxuriant, blooming, bursting, flourishing, proliferative, swarming, teeming, thriving, excess, extra, surplus, abundant, ample, bountiful, copious, generous, liberal, plenteous, plentiful.
Examples of usage:
Susannah gave scant observation to any of these things. "Out of the Air", Inez Haynes Irwin.
The day came to mean three scant meals. "The Magnetic North", Elizabeth Robins (C. E. Raimond).
He was to dine at the Herberts' at seven o'clock, and as their place was but scant two miles from town, he determined to walk. "The Just and the Unjust", Vaughan Kester.