Synonyms of 'slap-happy'
1 happy-go-luckyDictionary, casual, irresponsible
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I stood up and gave a casual glance behind me.
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.