فَاتِكٌ
1.
[act. particle n. of 1; generally meaning Assassinating; or an assassin:] one who comes upon another suddenly, or at unawares, or takes him by surprise, with some evil, or hateful, act, or [more commonly] with slaughter: and according to IDrd, one who, when he purposes a thing, does [it]: (Ham p. 43:) any one who attempts, or ventures upon, great, or formidable, affairs: (Az, TA:) bold, or daring; (S, O, K;) courageous: (K:) plural فُتَّاكٌ. (S, O, K.)
2.
[Hence,] فَاتِكُ
القَلْبِ (assumed tropical:) Penetrating, sharp, or vigorous, and effective, in mind. (TA.)
3.
And حَيَّةٌ فَاتِكَةٌ لِلسَّبُعِ (tropical:) [A serpent that attacks the beast of prey]. (TA.)
4.
And جَارِيَةٌ فَاتِكَةٌ (tropical:) A young woman who cares not for what she does nor for what is said to her. (TA.)