An unwelcome experience is one that you do not like and did not want.
例句
The media has brought more unwelcome attention to the Royal Family...媒體對王室的過度關注令人反感。A colleague made unwelcome sexual advances towards her.一個同事對她進行性騷擾。
ADJ-GRADED
（訪客）不受歡迎的
If you say that a visitor is unwelcome, you mean that you did not want them to come.
例句
...an unwelcome guest...不受歡迎的客人She was, quite deliberately, making him feel unwelcome.她是有意讓他覺得自己不受歡迎。
英漢詞典釋義
adj.
不受歡迎的, 令人失望的, 令人討厭的
I felt that we were unwelcome.我覺得我們是不受歡迎的。Dogs can deter unwelcome intruders.狗能夠阻攔不受歡迎的闖入者。He parried the unwelcome question very skilfully.他很巧妙地避開了那個不受歡迎的問題。He was pleased to be able to fling off such an unwelcome responsibility.能擺脫如此令人厭煩的責任他感到很高興。
英英詞典釋義
Adjective
1. not welcome; not giving pleasure or received with pleasure;