noun, verbal noun
When your tenseness is stretched out as far as it is, it becomes not just tenseness, but stress as well. The tension is crazy when you stretch it out like this!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
"I have a job interview tomorrow. I’m a little nervous." "Oh, really? Well, I’m sure you’ll do fine."