Antonym: easy. Similar words: abstract, obstruction, abstain, abstinence, abstemious, intrusive, obtrusive, frustrate. Meaning: [æb'struːs] 
adj. difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge.
adj. difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge. 
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31. However in this module abstruse the intellectual dot with abstraction is more, it is more difficult that in schoolteaching process we feel student understanding rises apparently.
32. Scientists are expounding and proving this abstruse and delicate theory.
33. To a craftsman , the ancient article with recondite and scholastic words was too abstruse to understand.
34. Because audio is reflexed , sound box is further from back wall, construct the sound field that give more abstruse, this is felt more easily in big room.
35. Which abstruse unreal novel do have to be in a fix now?
36. Without entering into an abstruse point of divinity , one thing is plain.
37. This business manager meets, begin vaunting annulus the history of abstruse company and earth baby brand and actual strength.
More similar words: abstract, obstruction, abstain, abstinence, abstemious, intrusive, obtrusive, frustrate, obstreperous, frustration, construe, instruct, structure, construct, instructor, struggle for, instrument, structural, instruction, destruction, construction, constructing, instructional, infrastructure, struggle against, ruse, rush, absorb, absent, absurd.