THESAURUS
let be
abandon, assume, be afraid, be conservative, believe, butt out, conceive, conclude, consider, cut, daresay, deduce, deem, divine, do nothing, dream, expect, fancy, feel, gather, goldbrick, goof off, grant, hold aloof, imagine, infer, jump, keep hands off, leave, leave alone, leave be, leave loose ends, leave undone, let, let alone, let dangle, let go, malinger, miss, not butt in, not get involved, not interfere, not make waves, not meddle, not tamper, omit, opine, oppose change, pass over, pass up, prefigure, presume, presuppose, presurmise, pretermit, procrastinate, provisionally accept, reckon, repute, say, shirk, skip, slack, stand aloof, stand pat, stand still, suppose, surmise, suspect, take, take for, take for granted, take it, take to be, think, trifle, understand
ROGET THESAURUS
let be
Inaction
VB
not do, not act, not attempt, be inactive, abstain from doing, do nothing, hold, spare, not stir, not move, not lift a finger, not lift a foot, not lift a peg, fold one's arms, fold one's hands, leave alone, let alone,
let be, let pass, let things take their course, let it have its way, let well alone, let well enough alone, quieta non movere, stare super antiquas vias, rest and be thankful, live and let live, lie rest upon one's oars, laisser aller, faire, stand aloof, refrain, keep oneself from doing, remit one's efforts, relax one's efforts, desist, stop, pause, wait, lie in wait, bide one's time, take time, tide it over, cool one's heels, kick one's heels, while away the time, while away tedious hours, pass the time, fill up the time, beguile the time, talk against time, let the grass grow under one's feet, waste time, lie by, lie on the shelf, lie in ordinary, lie idle, lie to, lie fallow, keep quiet, slug, have nothing to do, whistle for want of thought, undo, do away with, take down, take to pieces, destroy.
Permanence
VB
let alone,
let be, let it be, persist, remain, stay, tarry, rest, stet (copy editing) hold, hold on, last, endure, bide, abide, aby, dwell, maintain, keep, stand, stand still, stand fast, subsist, live, outlive, survive, hold one's ground, keep one's ground, hold one's footing, keep one's footing, hold good.
Continuance in action
VB
continue, persist, go on, jog on, keep on, run on, hold on, abide, keep, pursue, stick to its course, take its course, maintain its course, carry on, keep up, sustain, uphold, hold up, keep on foot, follow up, perpetuate, maintain, preserve, harp upon, keep going, keep alive, keep the pot boiling, keep up the ball, keep up the good work, die in harness, die with one's boots on, hold on the even tenor of one's way, pursue the even tenor of one's way,
let be, stare super antiquas vias, quieta non movere, let things take their course, stare decisis (Jurisprudence).