undo

1 to deprive of courage or confidence the sudden shriek undid the campers Synonyms demoralize, emasculate, paralyze, unnerve, unman, unstringRelated Words debilitate, enervate, enfeeble, neuter, weaken; prostrate, sap, soften, tire, waste; frighten, intimidate, psych (out), scare, terrify, terrorize; daunt, discourage, dishearten, dismay, dispirit; craze, derange, madden, unbalance, unhinge; discompose, disquiet, disturb, faze, perturb, unsettle, upset, weird outNear Antonyms fortify, strengthen; embolden, encourage, heartenAntonyms nerve

2 to disengage the knotted parts of undo a tangled shoelace Synonyms unbind, untie, unfasten, unlashRelated Words unbraid, unlace; disentangle, ravel, unravel, unsnarl, untangle, unwind; loose, loosenNear Antonyms braid, interlace, interweave, lace, wind; entangle, snarl, tangleAntonyms bind, fasten, knot, lash, tie

3 to trouble the mind of; to make uneasy the mere mention of the home invasion still had the power to undo her Synonyms agitate, ail, alarm (also alarum), bother, concern, derail, discomfort, discompose, dismay, disquiet, distemper, distract, distress, exercise, flurry, frazzle, freak (out), fuss, hagride, perturb, disturb, unhinge, unsettle, upset, weird out, worryRelated Words aggravate, anger, annoy, bug, chafe, chivy (or chivvy), exasperate, fret, gall, get, grate, harass, harry, irk, irritate, nettle, peeve, pester, pique, put off, put out, rile, vex; bedevil, haunt, plague; abash, confound, confuse, discomfit, disconcert, discountenance, embarrass, faze, fluster, jar, mortify, nonplus, rattle, shake up; daunt, demoralize, discourage, dishearten, dispirit, unnerveNear Antonyms allay, alleviate, assuage; appease, conciliate, mollify, pacify, placate, propitiateAntonyms calm, compose, quiet, settle, soothe, tranquilize (also tranquillize)