frequent adj.
VERBS be, seem | become The attacks have become increasingly frequent.
ADV. extremely, very | increasingly | fairly, quite, relatively She was a fairly frequent visitor to the house.
PREP. among Coughs and colds are frequent among young children.
PHRASES at frequent intervals She phoned home at frequent intervals.
You can also check other dicts: frequent (English, 中文解释 ), wordnet sense, Collins Definition