1. Being of a size less than common.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• undesided,
• undersined,
• undersided,
• underseved,
• undersinged,
• undersied,
• undersired,
• understed,
• underivedd,
• underived,
• undersise,
• undersizes,
• yndersized,
• hndersized,
• undersised,
• underszied,
• undersyzed,
• undiersified,
• unrevsied,
• undernsured

• underdog,
• underpart,
• undertide,
• underbred,
• underage,
• underwood,
• underlying,
• underwear,
• under fire,
• undershot,
• underfur,
• undercarriage,
• undermine,
• understated,
• understand,
• undersea,
• underwrite,
• underboss,
• underlie,
• underpass,
• undersell,
• underskirt,
• undermanned,
• unmodernized,
• underrate,
• undersoil,
• underslung,
• undersealed,
• underline,
• underside,
• underfed,
• underhanded,
• underprice,
• underhand,
• underseller,
• underseal,
• underworld,
• undersize,
• undercoated,
• unadorned,
• understood,
• unaddressed,
• unmoderated,
• undertone,
• Underdahl,
• understate,
• undersexed,
• understaffed,
• underspend,
• understudy,
• undershrub,
• understock,
• undersign,
• underbid,
• under wraps,
• undergrad,
• underbody,
• underscore,
• undertake,
• under arms,
• underspent,
• underdone,
• underwriter,
• understanding,
• underdown,
• undershirt,
• undersurface,
• undershoot,
• undergird,
• underived,
• undereducated,
• underhandedly.

The adverb form of "undersized" is "undersizedly".

The adjective form of "undersized" is "undersized".

The plural form of "undersized" is "undersizeds".

The singular form of the word "undersized" is "undersized". The word does not change in form when referring to a single object or person.