Synonyms for At first glance:

• adj.

  •extemporaneous/extemporary (adjective)
  • free,
  • casual,
  • automatic,
  • makeshift,
  • offhand,
  • snap,
  • immediate,
  • off the cuff,
  • unpremeditated,
  • made-up,
  • spontaneous,
  • informal,
  • winging it,
  • unstudied,
  • unprepared,
  • impromptu,
  • expedient,
  • unplanned,
  • ad hoc,
  • extempore.
  •Other relevant words: (adjective)
  • Improvisatory,
  • on impulse,
  • off top of head,
  • jamming,
  • Improviso,
  • spur of the moment,
  • on-the-spot,
  • tossed off,
  • IMPROV,
  • extemporary,
  • taking for ride,
  • spur-of-the-moment,
  • tossed out,
  • ad lib,
  • by ear,
  • off the top of head,
  • on the spot,
  • thought out loud,
  • snapper.

• adv

  •Other relevant words: (adverb)
  • once over lightly,
  • frivolously,
  • to the casual eye,
  • extraneously,
  • flimsily,
  • on the surface,
  • superficially,
  • not thoroughly,
  • ignorantly,
  • not profoundly.

• adv.

  •all (adverb)
  • at first glance,
  • at first sight.
  •superficially (adverb)
  • carelessly,
  • partially,
  • casually,
  • externally,
  • skim,
  • apparently,
  • hastily.

• Other synonyms:

  •Other relevant words:
  • catch,
  • centering,
  • skimming,
  • barren,
  • duck soup,
  • heedlessly,
  • coat,
  • evidently,
  • cursory,
  • unloosen,
  • everyday,
  • cracker bonbon,
  • give up,
  • nonchalant,
  • complimentary,
  • plane,
  • unwritten,
  • rake,
  • exempt,
  • machine rifle,
  • absolve,
  • tear,
  • free people,
  • insouciant,
  • center,
  • hurriedly,
  • liberate,
  • uncontrived,
  • lose it,
  • make-do,
  • in haste,
  • reflex,
  • shoot,
  • jury-rigged,
  • devoid,
  • child's play,
  • discharge,
  • in part,
  • patently,
  • manifestly,
  • rise,
  • automatic rifle,
  • cracking,
  • bust,
  • part,
  • snap fastener,
  • gratuitous,
  • loose,
  • snap bean,
  • walkover,
  • picnic,
  • click,
  • pushover,
  • grab,
  • unfreeze,
  • straightaway,
  • relinquish,
  • spontaneously,
  • ginger nut,
  • press stud,
  • breeze,
  • innocent,
  • superficial,
  • cream,
  • resign,
  • come on,
  • rupture,
  • dislodge,
  • liberal,
  • improvised,
  • spare,
  • rakishly,
  • cinch,
  • on-the-scene,
  • come out,
  • snatch,
  • elasticity,
  • nonchalantly,
  • costless,
  • plainly,
  • daily,
  • automatic pistol,
  • offhanded,
  • skim off,
  • unintentional,
  • unrehearsed,
  • perfunctory,
  • off-the-cuff,
  • ad libitum,
  • machinelike,
  • scan,
  • seemingly,
  • skimmed,
  • rise up,
  • intimate,
  • turn up,
  • piece of cake,
  • snarl,
  • obviously,
  • snapshot,
  • gratis,
  • relieve,
  • open,
  • crack,
  • detached,
  • on the face of it,
  • cozy,
  • shot,
  • photograph,
  • unwitting,
  • incautiously,
  • disengage,
  • flick,
  • skitter,
  • break down,
  • aerofoil,
  • cracker,
  • unloose,
  • control surface,
  • common snapping turtle,
  • skim over,
  • chance,
  • raffishly,
  • extemporarily,
  • reflexive,
  • quick,
  • automatonlike,
  • snatch up,
  • occasional,
  • glance over,
  • destitute,
  • earth's surface,
  • release,
  • robotic,
  • plain,
  • show up,
  • ginger snap,
  • extemporaneously,
  • partly,
  • effortless,
  • unblock,
  • ad-lib,
  • skip,
  • prompt,
  • rid,
  • free-and-easy,
  • stopgap,
  • offhandedly,
  • airfoil,
  • gingersnap,
  • robotlike,
  • passing,
  • electronic jamming,
  • run down,
  • cream off,
  • come up,
  • disembarrass,
  • extemporaneous,
  • contiguous,
  • self-generated,
  • jam.
  •Other relevant words (noun):
  • outwardly,
  • surface,
  • extrinsically,
  • to all appearances,
  • ostensibly.

Antonyms for At first glance:

• adj.

  • extemporaneous/extemporary
    prepared, read, written, Rehearsed, planned.

• adv.

  • superficially
    carefully, thoroughly, deeply.