intractable
[adjective]
Synonyms: unruly, fractious, indocile, indomitable, recalcitrant, undisciplinable, undisciplined, ungovernable, unmanageable, wild, obstinate, bullheaded, headstrong, mulish, pertinacious, perverse, refractory, self-willed, stubborn, unyielding

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Antonyms: tractable

[TahlilGaran] English Synonym Dictionary ▲

in‧trac‧ta‧ble /ɪnˈtræktəbəl/ adjective formal

1. an intractable problem is very difficult to deal with or solve:
the seemingly intractable problem of human greed

2. having a strong will and difficult to control
—intractability /ɪnˌtræktəˈbɪləti, ɪnˌtræktɪˈbɪləti/ noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲