impermissible

• POS: Adjective
• HYPHEN: im=per=mis=si=ble

CIDE DICTIONARY

impermissible, a. 

 Not permissible.  [1913 Webster]

OXFORD DICTIONARY

impermissible, adj. not allowable.

Derivative

impermissibility n.

ROGET THESAURUS

impermissible

Prohibition

N prohibition, inhibition, veto, disallowance, interdict, interdiction, injunction, estoppel, embargo, ban, taboo, proscription, index expurgatorius, restriction, hindrance, forbidden fruit, Maine law, prohibitive, prohibitory, proscriptive, restrictive, exclusive, forbidding, prohibited, not permitted, unlicensed, contraband, impermissible, under the ban of, illegal, unauthorized, not to be thought of, uncountenanced, unthinkable, beyond the pale, on no account, Int, forbid it heaven!, hands off!, keep off!, hold!, stop!, desist!, cease and desist!, avast!, that will never do, don't you dare, forget it, don't even think about doing it, go ahead, make my day.