not seldom (adverb) frequently: commonly, repeatedly
Sinonime: all aquiver, aquake, aquiver, ashake, faltering, fluctuant, infirm,
insecure, jellylike, jerry-built, jittery,
nervous, not set,
precarious, quaking, quivery, rattletrap, rickety, rocky, rootless, shaking, tottering, tottery, tremorous, tremulous, tumbledown, unfirm,
unsettled, unsound,
unstable, unsteady,
unsure,
vacillating,
wavering, weak, wobbly,
yieldingAntonime: firm, steady, unshaky,
unwavering