What does "thorny" mean?

Thorny: Like a thorn or thorns; hence, figuratively, troublesome; vexatious; harassing; perplexing. "The thorny point of bare distress." Shak. The steep and thorny way to heaven. Shak. Thorny rest-harrow (Bot.), rest-harrow. -- Thorny trefoil, a prickly plant of the genus Fagonia (F. Cretica, etc.).

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