"Expertness" is a word in ENGLISH

expertness ENGLISH
Definition:

Skill derived from practice; readiness; as, expertness
in seamanship, or in reasoning.

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The only way to live well is to feel intensely.

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experimental ENGLISH

Pertaining to experiment; founded on, or derived from, experiment or trial; as, experimental science; given to, or skilled in, experiment; …

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inexpert ENGLISH

Not expert; not skilled; destitute of knowledge or dexterity derived from practice.

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practical ENGLISH

Derived from practice; as, practical skill.

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stager ENGLISH

One who has long acted on the stage of life; a practitioner; a person of experience, or of skill derived …

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