on the underside (adverb) under: below
Sinonime: amaranthine, constant, continual, continuous, day and night, endless,
eternal,
everlasting,
incessant,
indefatigable, interminable, nonstop, on a treadmill,
perennial, perpetual, round the clock, unceasing, unending, uninterrupted, unremitting, untiring, world-without-end
Antonime: ceasing,
completed, concluded,
ending,
finished, infrequent,
irregular,
occasional