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pertinacious

adjective

/ˌpɜːrtɪˈneɪʃəs/

Meaning

holding firmly to an opinion, purpose, or course of action; stubbornly persistent

The pertinacious lawyer refused to give up the case.

stubborn, tenacious, determined, persistent, resolute

yielding, flexible, submissive

pertinacious effort, pertinacious belief, pertinacious lawyer

Causing or tending to cause disruption.

Unable to be upset or excited; calm.

causing shame; disgraceful; embarrassing

Tending to be different or to develop in different directions.

clever or skillful in using the hands or mind

Able to be sailed on or through by ships or boats.