tightly
adverb
ˈtaɪtli 
ˈtaɪtli closely and firmly; in a tight manner
Her eyes were tightly closed.He held on tightly to her arm.a tightly packed crowd of tourists
Usage note: tight / tightlyTight and tightly are both adverbs that come from the adjective tight. They have the same meaning, but tight is often used instead of tightly after a verb, especially in informal language, and in compounds: packed tight ◇ a tight-fitting lid. Before a past participle tightly is used: clusters of tightly packed flowers.