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A fifteen letter word that means easy is ultrasimplistic. Ultrasimplistic means easy to understand, deal with or use. It also means an ignorant, foolish or gullible person.
Straightforward
A fifteen letter word that contains the letters atragiclostnoun is congratulations!!!
Straightforward
trickier
The letters spell the word conundrums. It means a confusing and difficult problem or question.
smarty pants child
the scientific word that means difficult swallowing is " Dysphagia " ..
arduous, onerous, hellish, killing, complex, awkward, adverse
Both begin woth letter
dissertation I know it's short of 15 letters- maybe someone else has a better answer.
Defencelessness