Below are possible answers for the crossword clue Difficult; doubtful.
11 letter answer(s) to difficult; doubtful
PROBLEMATIC
difficult
making great mental demands; hard to comprehend or solve or believe; "a baffling problem"; "I faced the knotty problem of what to have for breakfast"; "a problematic situation at home"
open to doubt or debate; "If you ever get married, which seems to be extremely problematic"
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