doesn't
Refuses to act
Doesn't is the standard contraction of does not, used with third-person singular subjects to form negative statements.
She doesn't like olives.
It doesn't matter.
The contraction is universal in speech and informal writing, while the uncontracted form appears mainly in formal contexts or for emphasis.
He does NOT want to go.
isn't
Contraction negating existence
haven't · hasn't · hadn't · won't · wouldn't · shouldn't · couldn't · can't · mightn't · mustn't
- doesn't matterHas no significance
- it doesn't matterOf no importance
- if that doesn't beat allExclamation of amazed disbelief
- think one's shit doesn't stinkAssume personal superiority
- thinking one's shit doesn't stinkDelusional high self-opinion
- damned if one does and damned if one doesn'tBlamed whatever you choose