thorny

US /ˈθɔːr.ni/
UK /ˈθɔːr.ni/
"thorny" picture
1.

covered with thorns or spines

:
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The rose bush had many thorny stems.
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Be careful, that plant is very thorny.
:
pricklyspinybarbed
2.

causing difficulties or disagreements; complex and difficult to deal with

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The negotiations faced many thorny issues.
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It was a thorny problem that required careful consideration.
:
difficultproblematictrickycomplexintricate