STUMBLE

via this isn't happiness

stum·ble

ˈstəmbəl/

verb

gerund or present participle: stumbling

1. trip or momentarily lose one's balance; almost fall.

   "her foot caught a shoe and she stumbled"

   synonyms:

   trip (over/up), lose one's balance, lose/miss one's footing, slip "she stumbled and fell heavily"

   • trip repeatedly as one walks.

     "his legs still weak, he stumbled after them"

     synonyms:

     stagger, totter, teeter, dodder, blunder, hobble, move clumsily "he stumbled back home"

   • make a mistake or repeated mistakes in speaking.

     "she stumbled over the words"

     synonyms:

     stammer, stutter, hesitate, falter, speak haltingly;  informalfluff/flub one's lines "she stumbled through her speech"