adjective, thornier, thorniest.
abounding in or characterized by thorns
; spiny; prickly.
overgrown with thorns
painful; vexatious: a thorny predicament.
full of difficulties, complexities, or controversial points: a thorny question.
Origin: before 1000; Middle English; Old English thornig. Related forms
5. tough, sticky, ticklish, perplexing.