/ ʌnˈkɒnʃənəbl; NAmE -ˈkɑːn-/ adjective [ usually before noun ] ( formal )
1.
( of an action, etc. ) so bad, immoral, etc. that it should make you feel ashamed
2.
(often humorous ) too great, large, long, etc.
SYN excessive
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WORD ORIGIN
mid 16th cent.: from un- not + obsolete conscionable , from conscience (interpreted as a plural) + -able .