different between understandable vs understandably

English

From Middle English understondable, equivalent to understand +? -able.

understandable (comparative more understandable, superlative most understandable)

(capable of being understood): comprehensible, understandable; See also Thesaurus:comprehensible
(capable of being accepted): acceptable, excusable

(capable of being understood): incomprehensible, unfathomable; See also Thesaurus:incomprehensible
(capable of being accepted): inexcusable, unacceptable

understandable +? -ly

understandably (comparative more understandably, superlative most understandably)

For reasons that are easy to understand or sympathise with.
Understandably, he was too embarrassed to speak.
Embarrassed, he understandably refused to speak.
He was understandably embarrassed, and could not speak.
In an understandable manner.
When presenting in front of the class, take care to speak clearly and understandably.

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