Difficult (4)

(Other definitions for troublesome that I've seen before include "Causing annoyance" , "Trying" , "likely to cause ructions" , "problematic" , "Causing difficulty" .)

(Other definitions for trying that I've seen before include "Annoying; sampling" , "Difficult - annoying" , "Vexatious - having a go" , "Stressful" , "Taxing" .)

(Other definitions for taxing that I've seen before include "Physically or mentally demanding" , "hard work" , "Burdensome" , "Making heavy demands, like Revenue Commissioners" , "Making great demands" .)

(Other definitions for thorny that I've seen before include "Causing difficulty - like a bed of roses?" , "Difficult; prickly" , "Problematic; having spines" , "Troublesome or difficult - having spikes?" , "Spiny - difficult and controversial" .)

(Other definitions for knotty that I've seen before include "Complex - hard to solve" , "Tree trunk with hard masses - it's problematic" , "Tangled - snarled" , "Very difficult - complex" , "Describing a difficult problem" .)

(Other definitions for ornery that I've seen before include "Difficult to deal with" , "Cantankerous or mean (US)" , "Awkward" , "Mean - stubborn" .)

(Other definitions for tricky that I've seen before include "Complicated" , "Awkward - dishonest" , "Crafty, cunnning" , "Thorny" , "Ticklish" .)