「Adjectives and Adverbs」
「Usage Of Adverbs」
「Expression of Time」
”From beginning to end," "throughout"
Shūshi indicates that an action or a state continues to occur or exist with little variance throughout a period.
Kōgi no ma biru wa shūshi nōto o totte ita.
Bill was taking notes throughout the lecture.
Kinō no kaigi de Ono-san no kotoba wa shūshi odayaka datta.
At yesterday's meeting, Mr. Ono's words were amicable from beginning to end.
Hope this helps!
°˖ ✧◝(○ ヮ ○)◜✧˖ °こゆうきあいはら°˖ ✧◝(○ ヮ ○)◜✧˖ °