problematical, troublesome, complicated, difficult, dicey, trickier, troubling, inconvenient, worrisome, undesirable, advantageous, dangerous, irksome, perplexing, touchy, vexing, bothersome, counterproductive, costly, prohibitive, beneficial, risky, confusing, unfeasible, disconcerting, nettlesome, cumbersome, important, preferable, uncomfortable, unadvisable, onerous, desirable, useful, helpful, unpalatable, unworkable, unreliable, unstable, contentious, puzzling, impractical, unappealing, irritating, frustrating, disadvantageous, unsatisfactory, daunting, feasible, ineffective, thornier, detrimental, infeasible, irrelevant, untenable, restrictive, discomforting, harmful, impossible, iffy, questionable, expensive, unwise, unattractive, counterintuitive, awkward, ambiguous, unsettling, burdensome, unsuitable, stumbling block, annoying, perilous, prevalent, crucial, unpleasant, susceptible, interesting, unappetizing, unpopular, amenable, distasteful, unwieldy, inadvisable, peculiar, baffling, intractable, unavoidable, controversial, challenging, unhelpful, messy, distressing, disruptive, incompatible, stickier, unproblematic, irresolvable, imprecise, inapt, flawed, divisive, problematics, concerns, concept, dynamic, presuppositions, issues, ontology, postulates, tenet, theme, aporia, concepts, conundrum, dialectic, perspective, phenomenology, premises, raison, tenets, thematics, analogous, paradoxical, conflictual, mystifying, analagous, conflictive, salient, uncontroversial, bizarre, complex, describable

ticking bomb, time bomb

debatable, hard, knotty