thoughtlessness

As a noun thoughtlessness is

disregard for other's feelings.

Emptiness is a related term of thoughtlessness.

As a proper noun emptiness

is (astronomy) a chinese constellation near aquarius and equuleus, one of the 28 lunar mansions and part of the black turtle.

As a noun thoughtlessness is

disregard for other's feelings.

Triviality is a related term of thoughtlessness.

As nouns the difference between triviality and thoughtlessness

is that triviality is the quality of being trivial or unimportant while thoughtlessness is disregard for other's feelings.

Thoughtlessness is a related term of play.

As nouns the difference between thoughtlessness and play

is that thoughtlessness is disregard for other's feelings while play is activity for amusement only, especially among the young.

As a verb play is

(lb) to act in a manner such that one has fun; to engage in activities expressly for the purpose of recreation or entertainment.

Frivolity is a synonym of thoughtlessness.

As nouns the difference between frivolity and thoughtlessness

is that frivolity is frivolous act while thoughtlessness is disregard for other's feelings.

Giddiness is a related term of thoughtlessness.

As nouns the difference between giddiness and thoughtlessness

is that giddiness is the state of being giddy while thoughtlessness is disregard for other's feelings.

Folly is a related term of thoughtlessness.

As nouns the difference between folly and thoughtlessness

is that folly is while thoughtlessness is disregard for other's feelings.

Thoughtlessness is a related term of whimsy.

As nouns the difference between thoughtlessness and whimsy

is that thoughtlessness is disregard for other's feelings while whimsy is a quaint and fanciful idea a whim playfully odd behaviour.

As a verb whimsy is

to fill with whimsies or whims; to make fantastic; to craze.

Thoughtlessness is a related term of jest.

As nouns the difference between thoughtlessness and jest

is that thoughtlessness is disregard for other's feelings while jest is (archaic) an act performed for amusement; a joke.

As a verb jest is

to tell a joke; to talk in a playful manner; to make fun of something or someone .

Flightiness is a related term of thoughtlessness.

As nouns the difference between flightiness and thoughtlessness

is that flightiness is the quality of being flighty while thoughtlessness is disregard for other's feelings.