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"difficult" is also used as a crossword clue. If that's what you saw, the answer is often troublesome (11 letters).
Definitions
Hard to do or understand
Word origin
From Middle English difficult (ca. 1400), a back-formation from difficulte (whence modern difficulty), from Old French difficulté, from Latin difficultas, from difficul, older form of difficilis (“hard to do, difficult”), from dis- + facilis (“easy”); see difficile. Replaced native Middle English earveþ (“difficult, hard”), from Old English earfoþe (“difficult, laborious, full of hardship”), cognate to German Arbeit (“work”).
Used in a sentence
“difficult of accomplishment”
“However, the difficult weather conditions will ensure Yunnan has plenty of freshwater.”
“There is not the strength or courage left me to venture into the wide, strange, difficult world, alone.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“hard”9 letters
02“Hard to solve”9 letters
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