Danh từ＋らしい
True to type, worthy of the namemachine translation
FormationNoun + らしい (conjugates like an い-adjective: らしく・らしかった・らしくない)
Noun + らしい here means "true to type, worthy of the name" — having all the typical qualities people expect of that noun: 男らしい (manly, true to what a man should be), 春らしい天気 (weather that is typically spring-like), 日本らしい景色 (scenery that is quintessentially Japanese). This is always a compliment or a positive remark about being "true to form."
Characteristic らしい conjugates like an い-adjective: 彼らしく (in a way that is very much like him), らしかった. The negative form らしくない is very common: 遅刻するなんて、彼女らしくない (being late like this isn't like her at all — she normally isn't that way).
Don't confuse it with the hearsay らしい you learned at N4: hearsay らしい attaches to a whole clause in the plain form and expresses a guess based on information heard (雨が降るらしい), whereas characteristic らしい attaches ONLY directly to a noun and describes qualities. When you see 学生らしい, look at the context: "I hear (someone) is a student" or "student-like"? — usually the negative form らしくない and examples like 男らしい・春らしい can only be the characteristic meaning.
Examples
今日は春らしい暖かい一日だった。
Today was a warm day, truly spring-like.
彼は男らしい性格で、みんなに人気がある。
He has a manly character, so he's popular with everyone.
遅刻するなんて、いつも真面目な彼女らしくないね。
Being late like this is so unlike her — someone who is always so diligent.