adjective
inconsiderate
in-kuhn-SID-er-ut/ˌɪnkənˈsɪdərət/
Not caring enough about other people's feelings or needs.
The inconsiderate woman leaves her bags on seats needed by the man with a cane.

Etymology
The pieces express something 'not properly considered.' The meaning shifted from general thoughtlessness to failing to consider other people's feelings and the hurt or inconvenience one's actions cause.
In context
Don't order the most expensive drink in the menu >> just because >> just because you're not paying for it, that that can be deemed inconsiderate
More examples
- Leaving your dirty dishes for someone else is inconsiderate.
- His inconsiderate comments hurt her feelings.
- Please don't be inconsiderate of people waiting behind you.
Forms
inconsiderate
inconsiderately adverb — Without enough concern for other people's needs.
Similar words
- thoughtless
- Emphasizes failing to think about how actions affect others.
- selfish
- Emphasizes putting your own interests ahead of others' needs.
- rude
- Emphasizes impolite behavior rather than neglect of others' needs.