po-faced /pōˈfāst/ (informal)

1. (also shortened to po) stupidly solemn and narrow-minded
2. Stolid, humourless

• flexile
• flexing
• flexion
• flexions
• flexitarian
• flexitarians
• flexitime
• flexitimes
• flexographic
• flexographies
• flexography
• flex one's muscles
• flexor
• flexors
• Flextime®
• flexuose
• flexuous
• flexural
• flexure
• flexures
• fley
• fleyed
• fleying
• fleys
• flibbertigibbet