резко

1) General subject: abruptly, acutely, all of a heap, bitter, bitterly, bluntly, briefly, crustily, dramatically (наречие), edgily, gruffly, hardly, harshly, high (о звуке), hotly, pipingly, point blank, point-blank, rough, roundly, sharply, short, shortly, shrewdly, shrilly, stark, starkly, trenchantly, deeply, distinctly (to be distinctly different - резко отличаться), spur of the moment, severely, curtly

2) Colloquial: strong

3) Engineering: violently

4) Mathematics: drastically, widely

5) Religion: with sharpness

6) Economy: precipitously (The price of shares in the company dropped precipitously with the news of poor sales figures.(example from Cambridge Dictionary))

7) Diplomatic term: strongly

8) Jargon: smack, tough

9) Makarov: rudely, sharp, suddenly