inobservant
Fails to notice
Inobservant means not paying attention or failing to notice things.
Someone inobservant misses details others would catch: He was so inobservant he walked right past her without saying hello.
The word is uncommon; unobservant is the more usual choice.
Lacking any awareness
- unknowingLacking awareness or information
- unconsciousNot awake or aware
- ignorantLacking knowledge or awareness
- cluelessLacking any understanding
uninformed · unsuspecting · unwitting · blind · deaf · unenlightened · unacquainted · naive
Mentally elsewhere, not present
- absentmindedInattentive to immediate surroundings
- scatterbrainedLacking mental focus
- daydreamingIdle mental wandering
- unfocusedWithout clear direction
dreamy · absent · inattentive · sidetracked · lost · wool-gathering · miles away · spaced out
Failing in due care
- neglectfulFailing to care properly
- remissNeglectful of duty
- laxInsufficiently firm or rigorous
- slackAbsence of tautness
sloppy · slipshod · haphazard · perfunctory · derelict · irresponsible · imprudent · thoughtless
Feeling no worry
- apatheticWithout feeling or concern
- nonchalantCalmly unconcerned
- insouciantCarefree and unconcerned
- blaséUnimpressed through overexposure
detached · aloof · uninterested · impassive · disengaged · incurious · unresponsive · phlegmatic
oblivious
Lacking any awareness
- unknowingLacking awareness or information
- unconsciousNot awake or aware
- ignorantLacking knowledge or awareness
clueless · uninformed · unsuspecting · unwitting · blind · deaf · unenlightened · unacquainted · naive · innocent
preoccupied
Mentally elsewhere, not present
- absentmindedInattentive to immediate surroundings
- scatterbrainedLacking mental focus
- daydreamingIdle mental wandering
unfocused · dreamy · absent · inattentive · sidetracked · lost · wool-gathering · miles away · spaced out · zoned out
negligent
Failing in due care
- neglectfulFailing to care properly
- remissNeglectful of duty
- laxInsufficiently firm or rigorous
slack · sloppy · slipshod · haphazard · perfunctory · derelict · irresponsible · imprudent · thoughtless · reckless
unconcerned
Feeling no worry
- apatheticWithout feeling or concern
- nonchalantCalmly unconcerned
- insouciantCarefree and unconcerned
blasé · detached · aloof · uninterested · impassive · disengaged · incurious · unresponsive · phlegmatic · lackadaisical
inobservantperceptive
Quick to understand
sharp · acute · discerning · astute · perspicacious
observe, observer, observant, observation, observed, observing, observance, observable, observatory