You can use the word 'Extensive'
<span>When a social group is isolated for a long time, customs tend to ossify - making change difficult.
The verb <em>to ossify </em>in its primary meaning refers to bones hardening, to stiffening, fossilizing, solidifying, hardening. Its metaphorical meaning would be to stagnate, to cause difficulties, to cease developing, which is the meaning in the sentence above. </span>
Interpretation is when you explain the meaning of something.