false friends: zynisch does not always mean cynical

zynisch/cynical:

Duden:

1. auf grausame, den Anstand beleidigende Weise spöttisch ...
2. eine gefühllose, mitleidlose, menschenverachtende Haltung zum Ausdruck bringend, die bes. in bestimmten Angelegenheiten, Situationen als konträr, paradox u. als jmds. Gefühle verachtend u. verletzend empfunden wird ...

wissen.de:

• bissig-spöttisch, verletzend-frech

Oxford Dict of E:

1. believing that people are motivated purely by self-interest; distrustful of human sincerity or integrity - doubtful as to whether something will happen or whether it is worthwhile - contemptuous, mocking
2. concerned only with one's interests and typically disregarding accepted standards in order to achieve them

American Heritage:

• Believing or showing the belief that people are motivated chiefly by base or selfish concerns; skeptical of the motives of others
• Selfishly or callously calculating
• Negative or pessimistic, as from world-weariness
• Expressing jaded or scornful skepticism or negativity

So zynisch concentrates more on the "contemptuous" side, and (apparently) less on the distrust and doubt of cynical. Cynical, on the other hand, does not necessarily imply the extreme nastiness which is the main aspect of zynisch.

Is there really a difference, or are the dictionary entries for zynisch just rather misleading? I wouldn't use "cynically" here:
"Eine Beweisführung, die Hans Leyendecker in der Süddeutschen Zeitung zynisch kommentiert: „Das erinnert ein wenig an den alten Abzählreim ‚Eene meene muh, und raus bist du!“ " * ... must look into this more carefully later.

Is it worse to be cynical or jaded? (Guardian Notes and Queries)
"a cynic is someone who moans constantly but never does anything about anything and is determined to stay that way. Someone who's jaded hasn't lost the will to change, they've just lost the means. Scratch the surface of a cynic and you'll find someone who simply doesn't have any answers. Polish the surface of a jaded person and you'll find they'll come up good as new" *