• underfined,
• undersined,
• undersinged,
• undeppicted,
• undepigted,
• underminned,
• underminner,
• underpepled,
• ynderpinned,
• hnderpinned,
• jnderpinned,
• inderpinned,
• underlinned,
• uderpinned,
• unerpinned,
• underpined,
• undrepinned,
• undestinded,
• undestinned,
• undeprieved

• underhand,
• underfur,
• undergird,
• underpopulated,
• underplay,
• underdone,
• underwear,
• underproduce,
• underpay,
• underage,
• underworld,
• underwrite,
• underneath,
• undersign,
• underemployed,
• understated,
• undersealed,
• under wraps,
• undersexed,
• underwing,
• underhung,
• underlying,
• underperform,
• underfed,
• underlie,
• underived,
• underpayment,
• underrating,
• under fire,
• undermanned,
• underbred,
• undertone,
• undertaking,
• underhanded,
• undermine,
• undersoil,
• unadorned,
• underdown,
• undermentioned,
• undercarriage,
• underpass,
• underprice,
• underhandedly,
• underpart,
• underling,
• undercoated,
• underline,
• undersized,
• underpin,
• underexpose.

The adverb form of "underpinned" is "underpinningly".

The adjective form of the word "underpinned" is "underpinned".