in- + considerate

source: • my gif 1k 10k Gekkan Shoujo Nozaki Kun gsnk yuzuki seo Umetarou Nozaki Seo Yuzuki 0ci0 GSNK 0ci0 •

thoughtlessly causing hurt or inconvenience to others:

【人に/人の権利･感情などに】思いやりのない, 察してやらない «to/of» ; 無分別の, 軽率な

e.g. it's inconsiderate of her to go away without telling us.

inconsiderately |ˈˌinkənˈsid(ə)rətlē, ˈˌiNGkənˈsid(ə)rətlē| adverb

inconsiderateness |ˌinkənˈsid(ə)rətnəs| noun

inconsideration |ˌinkənˌsid(ə)ˈrāSH(ə)n| noun

late Middle English (originally in the sense ‘not properly considered’): from Latin inconsideratus, from in- ‘not’ + consideratus ‘examined, considered’ (see considerate).