IPA: /ɪnˈvælɪdɪzəm/
KK: /ɪnˈvælɪdɪzəm/
The state of being unable to work or function normally due to a long-term illness or disability.
His invalidism made it difficult for him to participate in many activities.
Invalidism is formed from "in-" (meaning not) and "validus" (from Latin, meaning strong or valid) and the suffix "-ism" (meaning a practice or belief). The term refers to a condition or belief related to being not valid or not strong, often used in the context of disability or chronic illness.
Think of 'not strong' ('in-' means not and 'validus' means strong) to remember that 'invalidism' refers to a belief or condition related to being not valid or strong.
No commonly confused words.