also: ったらしい
suffix, i-adjective
seeming very; looking like; reeking of
Attaches to nouns or adjective stems to express that someone or something strongly gives off a certain impression, usually negative. The resulting word is an i-adjective.
彼の言い訳は嘘たらしい。
His excuse reeks of a lie.
あの人は金持ちたらしい態度をしている。
That person acts like they're so rich.
Derived from the suffix たら (expressing a state or quality) combined with しい (adjectival ending). The exact origin is uncertain, but it likely developed as an emphatic, often pejorative, adjectival suffix.