Related by context. Frequent words. (Click for all words.) 56 daunting 56 lengthy 53 difficult 50 complicated 50 intensive 48 painful 47 challenging 47 rigorous 47 tricky 46 costly 46 frustrating 44 intense 42 undertaking 41 expensive 41 consuming 41 journey 41 contentious 39 rocky 39 ordeal 39 endure 39 obstacle 39 impossible 39 rewarding 38 toughest 38 tough 38 task 37 marathon 37 problematic 37 brutal 37 process 36 easy 36 endured 36 successful 36 completing 36 chaotic 36 worthwhile 35 tougher 35 extensive 34 prolonged 34 winding 34 enjoyable 34 endless 34 satisfying 34 unsuccessful 34 enduring 34 hour 34 overdue 34 delicate 34 epic 33 ambitious 33 risky 33 accomplished 33 steep 33 complex 33 unpredictable 32 lasted 32 undergo 32 harsh 32 miserable 32 obstacles 32 disastrous 32 confusing 32 hard 32 rough 32 straightforward 32 tasks 32 nightmare 31 challenge 31 inevitable 31 long 31 busy 31 completed 31 involves 31 remarkable 31 dangerous 31 hurdle 31 easier 31 grind 31 unpopular 31 thorough 31 exhausted 30 boring 30 harder 30 relentless 30 impressive 30 hazardous 30 fierce 30 slow 30 undertaken 30 awkward 30 requires 30 stiff 29 uncomfortable 29 preparation 29 trip 29 struggle 29 complete 29 undergoing 29 patience 29 tense 29 difficulty