fierce, be(come)சீறுcīṟu(siiru)(3 intr)be violent; be menacing; be hostile and fearful; be intense or forceful, as wind, flood, etc.; be wild and savage, esp. in appearance
Usage:
புலி சீறுவதைப் பார்த்து எல்லோரும் பயந்துவிட்டார்கள்puli cīṟuvataip pārttu ellōrum payantuviṭṭārkaḷ
puli siirrade paattu ellaarum bayanduṭṭaanga
Everyone got scared when they saw the fierce tiger.
பயங்கரமாகுpayaṅkaramāku(bayangramaahu)(3b intr)be or become terribly bad or severe, as a cold, fever, etc.; be or become eager; as a competition, a debate, a fight, etc.; be or become violent, wild, intense or forceful, as wind or storm
Usage:
அவன் காய்ச்சல் பயங்கரமாகிவிட்டதுavaṉ kāyccal payaṅkaramākiviṭṭatu
avan kaaccal bayangramaayiḍuccu
His fever became really fierce.