wrongheaded

Inflexible is a related term of wrongheaded.

As adjectives the difference between inflexible and wrongheaded

is that inflexible is not flexible; not capable of bending or being bent; stiff; rigid; firm; unyielding while wrongheaded is having an obstinately (persistently, stubbornly) perverse/erroneous opinion or judgement.

Wrongheaded is a related term of dogged.

As adjectives the difference between wrongheaded and dogged

is that wrongheaded is having an obstinately (persistently, stubbornly) perverse/erroneous opinion or judgement while dogged is stubbornly persevering, steadfast.

As a verb dogged is

(dog).

Contrary is a related term of wrongheaded.

As adjectives the difference between contrary and wrongheaded

is that contrary is opposite; in an opposite direction; in opposition; adverse while wrongheaded is having an obstinately (persistently, stubbornly) perverse/erroneous opinion or judgement.

As an adverb contrary

is contrarily.

As a noun contrary

is the opposite.

As a verb contrary

is (obsolete) to oppose; to frustrate.

Wayward is a related term of wrongheaded.

As adjectives the difference between wayward and wrongheaded

is that wayward is given to wilful, perverse deviation from the expected norm; tending to stray while wrongheaded is having an obstinately (persistently, stubbornly) perverse/erroneous opinion or judgement.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective wrongheaded is

having an obstinately (persistently, stubbornly) perverse/erroneous opinion or judgement.