一過性: transience

transience (disease, habit, emotions, etc) / transience (human experiences), being fleeting

一家: family / 一過: passing away

an emotion, a feeling, feelings, a sentiment

a strike, a collision; the sound of a collision; to strike, to collide

(と〜) thinking that […] (with the next clause explaining that the truth is contrary to expectations)

to seem, to appear

continuative of the passive of 思う (omou); continuative of 思われる (omowareru)

(as と思われ) (2channel slang) Synonym of と思う (to omou)

in my opinion; I think; I guess; upon thought; upon reflection; upon contemplation / conceivably; presumably