adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
idling; lazing around; slovenly
Describes a person who is lounging around lazily, often with a sloppy or unkempt appearance. Can be used as an adverb with と or as a する verb.
休みの日は一日中デレデレと過ごしてしまう。
On my days off, I end up lazing around all day.
彼はいつもデレデレしていて、だらしがない。
He's always lounging around sloppily.
adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
flirting; being lovestruck; fawning
Describes someone who is acting silly or overly affectionate because they are infatuated, often in a romantic or flirtatious context. Can be used with と or as a する verb.
彼は彼女の前だとデレデレになる。
He gets all lovey-dovey in front of her.
あの二人、いつもデレデレしていて見てられない。
Those two are always flirting; I can't stand watching them.