fidget

As an adjective jittery

is nervy, jumpy, on edge.

As a verb fidget is

to wiggle or twitch; to move around nervously or idly.

As a noun fidget is

(informal) a person who fidgets, especially habitually.

As a verb fidget

is to wiggle or twitch; to move around nervously or idly.

As a noun fidget

is (informal) a person who fidgets, especially habitually.

As an adjective undefined is

lacking a definition or value.

As verbs the difference between twidle and fidget

is that twidle is while fidget is to wiggle or twitch; to move around nervously or idly.

As a noun fidget is

(informal) a person who fidgets, especially habitually.

As a verb fidget

is to wiggle or twitch; to move around nervously or idly.

As a noun fidget

is (informal) a person who fidgets, especially habitually.

As an adjective cranky is

(obsolete) weak, unwell.

As a verb fidget

is to wiggle or twitch; to move around nervously or idly.

As a noun fidget

is (informal) a person who fidgets, especially habitually.

As an adjective restless is

not allowing or affording rest.

As nouns the difference between tremors and fidget

is that tremors is while fidget is (informal) a person who fidgets, especially habitually.

As a verb fidget is

to wiggle or twitch; to move around nervously or idly.

As a verb fidget

is to wiggle or twitch; to move around nervously or idly.

As a noun fidget

is a person who fidgets, especially habitually.

As an adjective tedious is

boring, monotonous, time consuming, wearisome.

As nouns the difference between fidget and nervousness

is that fidget is (informal) a person who fidgets, especially habitually while nervousness is the state or quality of being nervous.

As a verb fidget

is to wiggle or twitch; to move around nervously or idly.

In intransitive terms the difference between fidget and flutter

is that fidget is to wiggle or twitch; to move around nervously or idly while flutter is of a winged animal: to flap the wings without flying; to fly with a light flapping of the wings.

In transitive terms the difference between fidget and flutter

is that fidget is to cause to fidget; to make uneasy while flutter is to drive into disorder; to throw into confusion.

As verbs the difference between bustling and fidget

is that bustling is while fidget is to wiggle or twitch; to move around nervously or idly.

As nouns the difference between bustling and fidget

is that bustling is a bustle; a busy stir while fidget is (informal) a person who fidgets, especially habitually.