甘く

lightly; not seriously

→ 甘い
甘 sweet + く Adverbial form
adjective Rare #26,287
lightly; not seriously In 甘く見る, it means to underestimate or not take someone or something seriously.
JA: 世間を甘く見るな!
EN: Don’t underestimate the world!
Forms of 甘い

私を甘く見るな。

Don't underestimate me.

俺を甘く見るなよ。

Don't underestimate me.

対戦相手を甘く見るな。

Don't underestimate your opponent.

甘く見るなよ

Don’t underestimate me.

— エリート・スクワッド (2007)

世間を甘くみるな!

Don’t underestimate the world!