fierce, be(come) சீறு cīṟu (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 பயந்துவிட்டார்கள் puli cīṟuvataip pārttu ellōrum payantuviṭṭārkaḷ puli siirrade paattu ellaarum bayanduṭṭaanga Everyone got scared when they saw the fierce tiger.
பயங்கரமாகு payaṅkaramāku (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 பயங்கரமாகிவிட்டது avaṉ kāyccal payaṅkaramākiviṭṭatu avan kaaccal bayangramaayiḍuccu His fever became really fierce.