<p><strong>Noun</strong></p><ul><li>lack of interest or concern: We were shocked by their indifference toward poverty.</li><li>unimportance; little or no concern: Whether or not to attend the party is a matter of indifference to him.</li><li>the quality or condition of being indifferent.</li><li>mediocre quality; mediocrity.</li><li>Baseball. the absence of effort by the defense to prevent a stolen base: For the second time this inning, a Brewer has taken second base on indifference.</li></ul>