'Unconfident.' U-n-c-o-n-f-i-d-e-n-t. 'Unconfident.' -Of course, that's a word he's well acquainted with.
11 seconds sound clip from the A Boy Named Charlie Brown movie soundboard.
You can hear this line at 01:12:16.866 in the DVD version of the movie.
Quote context
[...]
- That blockhead. He's falling asleep.
- 'Supersede.' S-u-p-e-r-s-e-d-e. 'Supersede.'
- 'Irritable.' I-r-r-i-t-i-b-l-e. 'Irritable.'
- 'Recommend.' R-e-c-o-m-m-e-n-d. 'Recommend.'
- 'Invitation.' I-n-v-i-t-a-t-i-o-n. 'Invitation.'
- 'Production.' P-r-o-d-u-c-t-i-o-n. 'Production.'
- 'Tyranny.' T-y-r-r-a-n-y. 'Tyranny.'
- 'Indispensable.' I-n-d-i-s-p-e-n-s-i-b-l-e. 'Indispensable.'
- 'Irresistible.' I-r-r-e-s-i-s-t-a-b-l-e. 'Irresistible.'
- 'Repetition.' R-e-p-e-t-i-o-n. 'Repetition.'
[...]