keeping under one's hat (verb) withhold: keep back
Sinonime: boundless, disproportionate, dissipated, dizzying, enormous, exaggerated, exorbitant, extra, extravagant, extreme, immoderate, indulgent, inordinate, intemperate, limitless, more, needless, over, overboard, overkill, overmuch, plethoric, prodigal, profligate, recrementitious, redundant, self-indulgent, sky-high, steep, stiff, stratospheric, super, superabundant, superfluous, supernatural, too many, towering, unbounded, unconscionable, undue, unmeasurable, unreasonable, way out
Antonime: let go,
release