an enemy / an opponent, a competitor / (historical) the other party in a lawsuit / 的: (historical) in the red-light district, a term of reference used between prostitutes and customers

的: (historical) (by extension from the red-light district usage) term of third-person reference: that guy, that one

(used after an adjective in the te-form) unbearable / unable to lose to; no match for

to rival

enemy / foe

(idiomatic) to avoid being seen; to be clandestine

(Internet slang) avoiding search engines; making something difficult to reach via a search engine

everything

(colloquial) current boyfriend

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)