was proofing

• past progressive

  past progressive

  Used to describe an ongoing action or continuous state that was happening at a specific time in the past.

  of proof.
  proof

  noun

  evidence sufficient to establish a thing as true, or to produce belief in its truth.

Related Words

• argument
• clue
• confirmation
• criterion
• data
• demonstration
• information
• picture
• reason
• testament
• testimony
• validation
• verification