Толковый словарь английского языка Oxford English Reference - ish

1. suffix forming adjectives: 1 from nouns, meaning: a having the qualities or characteristics of (boyish). b of the nationality of (Danish). 2 from adjectives, meaning 'somewhat' (thickish). 3 colloq. denoting an approximate age or time of day (fortyish; six-thirtyish). Etymology: OE -isc 2. suffix (also -ise) forming verbs (vanish; advertise). Etymology: from or after F -iss- (in extended stems of verbs in -ir) f. L -isc- incept. suffix