Adverb

(en adverb)

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.

* {{quote-news

, year=2011 , date=October 1 , author=Phil McNulty , title=Everton 0 - 2 Liverpool , work=BBC Sport citation , page= , passage=Everton were, perhaps understandably , deflated at the setback and it was no surprise when Suarez added Liverpool's second after 82 minutes. Distin and Baines were involved in a mix-up as the Uruguayan advanced into the area, and he was not about to pass up the gift to shoot low past Howard.}}

In an understandable manner.

When presenting in front of the class, take care to speak clearly and understandably .

Adverb

(en adverb)

In an understanding manner.

(obsolete) In a way that can be understood; intelligibly.

*, vol.I, New York, 2001, p.232:

Garcias ab Horto writes of one whom he saw at Goa in the East Indies, that took ten drams of opium in three days; and yet consulto loquebatur , spake understandingly  […].