delicate matter, intricacy, difficulty

get into trouble or difficulty

discernment, minuteness, perspicacity

quick of apprehension, penetrating, discerning

discerning, penetrating, quick of apprehension, perspicacious

troublesome, vexatious

one who likes profound or abstruse topics, one who likes to undertake difficult tasks

preference for difficulty, complexity

to leave no stone unturned, to try everything

do one's very best, leave no stone unturned

with difficulty

without problem/obstacle

with great difficulty