leak-proof (adjective) impermeable: impenetrable
Sinonime: awkward, bullheaded,
cantankerous,
contrary, hang tough, hard-line, headstrong, immovable, incompliant, incurable, indocile,
indomitable, insoluble, locked in, mulish,
obdurate, obstinate, pat, pertinacious, perverse, pigheaded,
recalcitrant, refractory, resolute, self-willed, set in stone,
tenacious, tough, tough-nut, unbending,
uncompromising, uncooperative, undisciplined, ungovernable, unmanageable, unpliable,
unruly, unyielding,
wayward,
wild, willful
Antonime: amenable, easy,
facile,
manageable