willfully

As an adjective adamant

is firm; unshakeable; unyielding; determined.

As a noun adamant

is an imaginary rock or mineral of impenetrable hardness; a name given to the diamond and other substances of extreme hardness.

As an adverb willfully is

in a willful manner.

As a noun lecture

is (senseid) a spoken lesson or exposition, usually delivered to a group.

As a verb lecture

is (senseid)(ambitransitive) to teach (somebody) by giving a speech on a given topic.

As an adverb willfully is

in a willful manner.

As adverbs the difference between willfully and obligingly

is that willfully is in a willful manner while obligingly is in an obliging manner.

As adverbs the difference between willfully and stubbornly

is that willfully is in a willful manner while stubbornly is in a stubborn manner.

As adverbs the difference between willfully and intentionally

is that willfully is in a willful manner while intentionally is in an intentional manner, on purpose.

As adverbs the difference between deliberately and willfully

is that deliberately is intentionally, or after deliberation; not accidentally while willfully is in a willful manner.

As an adverb willfully is

in a willful manner.

As a noun taxonomy

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

As an adverb willfully is

in a willful manner.

As adverbs the difference between willfully and voluntarily

is that willfully is in a willful manner while voluntarily is in a voluntary manner.