1.
Animated Stroke Order
肆无忌惮 (sì wú jì dàn): Act recklessly without care for anyone else (verb/idiom) — Meaning & Stroke Order
four (used in financial contexts to prevent fraud)
to avoid, to abstain from; jealousy
to fear, dread, or be afraid of
More vocabulary at the same HSK level as 肆无忌惮.