1.
If you describe someone’s behaviour or feelings as ~, you think that they have reacted to a situation in a natural way or in the way you would expect.
His unhappiness was ~.
ADJ
understandably
The duke is understandably proud of Lady Helen and her achievements...
Most organizations are, quite understandably, suspicious of new ideas.
ADV: ADV adj, ADV with cl
2.
If you say that something such as a statement or theory is ~, you mean that people can easily understand it.
Roger Neuberg writes in a simple and ~ way.
= comprehensible
ADJ