Meaning of -ISH in English

-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

Oxford English vocab.      Оксфордский английский словарь.