The root word for unexpectedly is "expect."
"Unexpectedly" is an adverb. It is used to modify verbs, adjectives, or other adverbs by indicating the manner in which something happens.
The root word of "unusual" is "usual."
The root word is gift.
The root word of "endless" is "end."
Tri is the root word of intricate. The root word means three.
unsudden
He had arrived unexpectedly and they were delighted to see him.
Surprise would be the world. It is unexpectedly sudden.
He had no illness, so Harvey's death came unexpectedly. Unexpectedly, the couch exploded. It was an unexpectedly brief encounter. Unexpectedly, the monkey counted the beans correctly.
I was very happy when my brother came to visit unexpectedly this weekend.
Suprisingly.
surprisingly
He took a week off when his mother died unexpectedly last year.
strangely, bizarrely uniquely, unexpectedly, uniquely, coincidentally, sometimes ironically, unexpectedly
abruptly, unexpectedly
Encountering or meeting unexpectedly
unexpectedly