Not quick or alert in perception, feeling, or intellect; not sensitive or observant
Examples:
Her obtuse angle of reasoning puzzled the mathematicians.The novel's obtuse symbolism left readers debating its meaning.Despite his obtuse nature, his enthusiasm was infectious.
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Abstruse
/əbˈstruːs/
Difficult to understand or complex
Examples:
The scientist's theory was considered abstruse by many of her peers.Despite his best efforts, the abstruse text eluded his understanding.Philosophy often dives into abstruse concepts that challenge the mind.
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Ways to tell them apart:
Obtuse relates to something not sharp or clear, think of an obtuse angle in geometry which is more than 90 degrees.
Abstruse is used to describe something very difficult to understand, think of abstract art which can be hard to interpret.
Remember that obtuse is often used to describe people who are slow to perceive something, while abstruse is used for complex ideas or theories.