insure C2+

/ɪnˈʃʊr/ to arrange financial compensation against loss, damage, or harm

sureness C2+

/ˈʃʊrnəs/ the quality of being certain, confident, or reliably accurate

insecurity C2+

/ˌɪnsɪˈkjʊrɪti/ a feeling of uncertainty or anxiety; lack of safety or stability

assuredly C2+

/əˈʃʊrədli/ certainly; without doubt

securely C2+

/sɪˈkjʊrli/ in a firmly fastened, safe, or confident manner

secureness C2+

/sɪˈkjʊrnəs/ the state or quality of being secure, safe, or firmly fixed