incomprehensible β impossible to understand or comprehend; unintelligible.
puzzling β confusing or baffling: a puzzling answer.
slippery β tending or liable to cause slipping or sliding, as ice, oil, a wet surface, etc.: a slippery road.
subtle β thin, tenuous, or rarefied, as a fluid or an odor.
tricky β given to or characterized by deceitful tricks; crafty; wily.
volatile β evaporating rapidly; passing off readily in the form of vapor: Acetone is a volatile solvent.
baffling β impossible to understand; perplexing; bewildering; puzzling
cagey β If you say that someone is being cagey about something, you mean that you think they are deliberately not giving you much information or expressing an opinion about it.
deceitful β If you say that someone is deceitful, you mean that they behave in a dishonest way by making other people believe something that is not true.
deceptive β If something is deceptive, it encourages you to believe something which is not true.
fallacious β containing a fallacy; logically unsound: fallacious arguments.
fraudulent β characterized by, involving, or proceeding from fraud, as actions, enterprise, methods, or gains: a fraudulent scheme to evade taxes.
fugacious β fleeting; transitory: a sensational story with but a fugacious claim on the public's attention.
fugitive β a person who is fleeing, from prosecution, intolerable circumstances, etc.; a runaway: a fugitive from justice; a fugitive from a dictatorial regime.
greasy β smeared, covered, or soiled with grease.
imponderable β not ponderable; that cannot be precisely determined, measured, or evaluated.
indefinable β not definable; not readily identified, described, analyzed, or determined.
insubstantial β not substantial or real; lacking substance: an insubstantial world of dreams.
intangible β not tangible; incapable of being perceived by the sense of touch, as incorporeal or immaterial things; impalpable.
cunning β Someone who is cunning has the ability to achieve things in a clever way, often by deceiving other people.
devious β If you describe someone as devious you do not like them because you think they are dishonest and like to keep things secret, often in a complicated way.
dissembling β to give a false or misleading appearance to; conceal the truth or real nature of: to dissemble one's incompetence in business.
indirect β not in a direct course or path; deviating from a straight line; roundabout: an indirect course in sailing.
lying β the manner, relative position, or direction in which something lies: the lie of the patio, facing the water. Synonyms: place, location, site.
oblique β neither perpendicular nor parallel to a given line or surface; slanting; sloping.
shuffling β moving in a dragging or clumsy manner.