1.Definition: inconsistent with reason or logic or common sense

"The absurd predicament of seeming to argue that virtue is highly desirable but intensely unpleasant"

2.Definition: so unreasonable as to invite derision

"The absurd excuse that the dog ate his homework"

Related Adjective(s):cockeyed, derisory, idiotic, laughable, ludicrous, nonsensical, preposterous, ridiculous