abstruseness
arduousness
bothersomeness
burdensomeness
complicacy
complication
convolution
crabbedness
crampedness
deepness
difficultness
difficulty
entanglement
esoterica
hairiness
hardness
inscrutability
intricacy
involvement
knottiness
laboriousness
onerousness
oppressiveness
profoundness
profundity
reconditeness
rigor
rigorousness
ruggedness
strenuousness
toilsomeness
toughness
troublesomeness
quality
complicatedness
elaborateness
elaboration
involution
tapestry
tortuousness
trickiness
complexus
complicate
accuracy
development
dimension
diversity
efficiency
flexibility
intensity
limitation
magnitude
possibility
scope
significance
subtlety
uncertainty
unity
variation
variety
perplexity
simplicity