がちがち
chattering (teeth), (frozen, worried) stiff, rigid (personality, thinking, etc.), inflexible, overly serious, voracious (e.g. work, study), without slack or pause
きりきり
chafing, grinding (e.g. teeth), binding tightly, pulling tight (e.g. a bow), rotating quickly, hurting sharply, briskly, quickly, promptly, at once, right away
へらへら
foolishly (laughing), thoughtlessly (smiling), indiscreetly (talking), carelessly (speaking), frivolously, flippantly, thin (paper, cloth, etc.), weak-bodied, flaring up, bursting into flames
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