Modifiers matching invalid:

• kind-hearted,
• good-hearted,
• brilliant,
• optimistic,
• crippled,
• socially-unintelligent,
• bumbling,
• stubborn,
• inspirational,
• aloof,
• socially-unaware,
• socially-awkward,
• arrogant,
• insightful,
• weak,
• scientific,
• gangly,
• sympathetic,
• innocent,
• rigid,
• inspiring,
• gentle,

Simple categories matching optimistic:

• scholar,
• person,
• duck,
• child,
• billionaire,
• lover,
• boxer,
• soldier,
• clown,
• hero,
• invalid,
• lawyer,
• warrior,
• philosopher,
• director,
• shyster,
• guru,
• sidekick,
• writer,
• poet,
• politician,