interjection / verb / noun
wow
WOW/waʊ/
Great surprise or admiration.
Wow, that flowering plant looks spectacular in full bloom!

Etymology
Recorded in Scottish use as a natural expression of amazement, this interjection expresses the reaction itself rather than drawing its meaning from an older descriptive word.
In context
Wow. >> And that funeral was 5 years ago. Wow. >> Yeah. >> I'm just now starting to realize the impact of it, how it shaped my theology.