freeze up (verb) panic: become, make afraid or distressed
Sinonime: adamancy, bullheadedness, contumacy, die-hardism, doggedness, grimness, implacability, implacableness, incompliance, incompliancy, indomitability, inexorableness, inflexibility, inflexibleness, intransigence, intransigency, mulishness, obduracy, obdurateness, obstinacy, perseverance, pertinacity, pigheadedness, relentlessness, remorselessness, rigidity, rigidness
Antonime: be calm, be content