Related by context. Frequent words. (Click for all words.) 61 persisted 54 chronic 54 lingering 53 persist 52 persists 52 widespread 52 nagging 51 constant 51 continual 51 relentless 50 dogged 49 pervasive 49 stubborn 47 sporadic 47 frequent 47 rampant 46 severe 44 repeated 44 plagued 44 persistence 44 serious 42 prolonged 42 intense 41 mounting 41 continuous 41 perpetual 40 longstanding 40 intensifying 40 troublesome 40 worsening 40 vigorous 39 enduring 39 continued 39 intensified 38 rife 38 despite 38 recurring 38 steadfast 38 sustained 38 mild 38 overcoming 38 heavy 37 weak 37 ongoing 37 occasional 36 debilitating 36 steady 36 prevalent 36 exacerbated 36 beset 36 linger 36 acute 36 concerted 36 afflicted 36 fierce 36 continuing 35 resilient 35 Continued 35 overcome 35 heightened 35 hampered 35 combating 35 perennial 35 forceful 35 periodic 34 entrenched 34 rash 34 consistent 34 strong 34 crippling 34 aggressive 33 troubling 33 riddled 33 escalating 33 Serious 33 protracted 33 slight 33 spite 33 perceived 33 renewed 33 robust 33 recent 33 worrisome 33 growing 32 prone 32 plague 32 compounded 32 nasty 32 induced 32 increasing 32 hindered 32 eradicate 32 erratic 32 stymied 32 battling 32 pressing 32 susceptible 32 rising 31 overcame 31 endured 31 ferocious