kept lid on (verb) constrain: force; restrain
Sinonime: abounding, abundant,
bountiful, breeding, copious,
creative, fecund, fertile, generating, generative, luxuriant, profuse, proliferant,
rank, reproducing, reproductive, rich, spawning, swarming, teeming,
yieldingAntonime: barren,
fruitless, impotent, unfruitful, unproductive