Offhand

Adjective

1. Without planning or thinking ahead.
2. Careless; without sufficient thought or consideration.
3. Curt, abrupt, unfriendly.

Synonyms

• (without planning): impromptu, extemporaneous, off-the-cuff

Adverb

1. Right away, immediately, without thinking about it.
2. In an offhand (adjective) manner.