N2 — outside your level filter
not properly + write + not
roku ni kakanai
not properly; hardly at all — criticizes the manner or adequacy of an act, not its degree
meaning: not write properly
このところ忙しくて、ろくに練習していない。
kono tokoro isogashikute, roku ni renshuu shite inai.
I've been busy lately, and I haven't been practicing properly. neutral
あの人、ろくに調べもしないで文句ばっかり言うんだよ。
ano hito, roku ni shirabe mo shinaide monku bakkari iu n da yo.
That guy complains nonstop without even looking into things properly. casual