Synonyms of 'slap-happy'
1 happy-go-luckyDictionary, casual, irresponsible
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If you feel giddy, you feel unsteady and think that you are about to fall over, usually because you are not well.
He felt giddy and light-headed.
If you describe something as haphazard, you are critical of it because it is not at all organized or is not arranged according to a plan.
The investigation does seem haphazard.
Thesaurus for slap-happy from the Collins English Thesaurus
If you describe someone as slap-happy , you believe they are irresponsible and careless.