| brain-sickly | foolishly, in such an addle-headed way |
| dote | become deranged, behave foolishly |
| fond | foolishly, stupidly |
| fondly | foolishly, stupidly, madly |
| giddily | madly, foolishly, insanely |
| grossly | stupidly, senselessly, foolishly |
| idly | foolishly, crazily, frivolously |
| lewdly | stupidly, foolishly |
| prodigal | wastefully lavish, foolishly extravagant |
| Prodigal | in the Bible, describing a son who foolishly wastes his share of his father's estate |
| silly-ducking | foolishly bowing, ridiculously obsequious |
| unskilfully | ignorantly, foolishly, in an uninformed way |
| wag | talk foolishly, utter silly remarks |