abashment, aggravation, annoyance, anxiety, balk, barrier, baulk, bewilder, bewilderment, bind, block, blockage, bother, chaos,
clod, clog, clutter, cluttering, commingle, complexity, concern, confusion, conundrum, cramp, crud, cumber, derangement, difficulty, disarray, discomfort, dismaying, disorder, disquiet, disquietude, disruption, distraction, disturbance, drawback, embarrassment, encumbrance, enigma, ferment, fidget, flutter, fretfulness, handicap, hardship, helter-skelter, hinder, hindrance, hugger-mugger, huggermugger, hurdle, immixture, impediment, interference, intermixture, intimidation, intricacy, jumble, jump, knot, maelstrom, malaise, maze, mess, misgiving, mix-up, muddle, muss, mystery, nuisance, obstacle, obstruction, pell-mell, perturbation, prevention, puzzle, qualm, quiz, ravel, restlessness, riddle, ruffle, rupture, shambles, sheer, snag, stickler, stumbling-block, stymie, suspense, tangle, teaser, termination, trammel, trepidation, trouble, tumult, turbulence, turmoil, unease, uneasiness, unrest, welter, worry