Knowledgeability

The quality of being well informed and able to use that knowledge.

Reach for it when naming demonstrated command of a subject in formal evaluation

The guide's knowledgeability reassured hikers before the difficult crossing.

• everyday

  command of the subject

  a clear phrase conveys confident understanding

  not when Command may sound absolute when the evidence shows solid but incomplete knowledge.

• warm

  learning

  study and intellectual cultivation deserve praise

  not when Learning can be theoretical and is less natural as a personal quality count.

• professional

  competence

  the person can perform reliably

  not when Competence can come from routine skill without broad subject knowledge.

• professional

  expertise

  deep specialized mastery is well evidenced

  not when Expertise claims a higher level than general knowledgeability.

• formal

  informedness

  possession of relevant current facts is what matters

  not when Informedness is awkward and says little about applying the information.

• literary

  erudition

  wide scholarly learning is the distinction

  not when Erudition sounds academic and may not include practical application.

• ignorance
• inexperience
• misinformation

• demonstrated knowledgeability

  Demonstrated knowledgeability mattered more than polished presentation.

• technical knowledgeability

  Her technical knowledgeability helped the panel ask better questions.

• guide's knowledgeability

  The guide's knowledgeability became clear when the weather changed.

• Knowledgeable adj.
• Knowledgeably adv.

Knowledgeability is valid but awkward; expertise, knowledge, or command of the subject will usually read more naturally.