offhand (adv.)
- airily
- aloof
- anyhow
- carelessly
- casually
- clumsily
- cursorily
- easy
- extemporaneously
- extemporarily
- extempore
- familiarly
- forgetfully
- haphazardly
- heedlessly
- helter-skelter
- impromptu
- inattentively
- incidentally
- inconsiderately
- informally
- loose
- messily
- naturally
- offhanded
- offhandedly
- parenthetically
- perfunctorily
- plain
- plainly
- promiscuously
- recklessly
- regardless
- simply
- slapdash
- sloppily
- superficially
- tactlessly
- thoughtlessly
- unassumingly
- unceremoniously
- unmindfully
- unofficially
- unthinking
- unthinkingly
- unwarily
offhand (adj.)
- abrupt
- ad-lib
- affable
- airy
- aloof
- blase
- brusque
- careless
- casual
- cavalier
- cool
- cordial
- cursory
- curt
- degage
- devil-may-care
- distant
- easy
- easygoing
- extemporaneous
- extemporary
- extempore
- familiar
- flippant
- folksy
- forgetful
- glib
- gracious
- heedless
- helter-skelter
- homely
- homey
- impromptu
- improvised
- inconsiderate
- indifferent
- informal
- insouciant
- irregular
- jury-rigged
- lackadaisical
- lazy
- light-hearted
- loose
- makeshift
- natural
- nonchalant
- oblivious
- off-the-cuff
- offhanded
- perfunctory
- plain
- reckless
- regardless
- relaxed
- simple
- slapdash
- smooth
- sociable
- spur-of-the-moment
- superficial
- tactless
- thoughtless
- unaffected
- unassuming
- unceremonious
- unconcerned
- unconstrained
- unconventional
- undiplomatic
- ungracious
- unheeding
- uninterested
- unmindful
- unofficial
- unpremeditated
- unprepared
- unready
- unrehearsed
- unstudied
- untactful
- unthinking
